Honda - Accord :: Brake Pedal Loses Pressure And Slowly Sinks To The Floor In Warm Weather
May 21, 2015
I have a problem about which the mechanics I have asked are baffled: In cool, cloudy or sunny weather, my brakes and break-pedal pressure are fine (the mechanics have said I have good fluid, brakes, etc.--they can find nothing wrong--and, of course, it never has a problem when they test-drive my car). However, when the weather warms up and it's a bright, sunny day, my brake pedal loses pressure and slowly sinks to the floor--a dangerous thing at intersections. There's slight pressure if I pump the pedal constantly while at a light; but, without pumping, the pedal immediately sinks to the floor.
This is a real problem, because this problem always occurs right when mechanics are not near or not open for business--and none I've talked to have ever heard of such a problem. The bright, hot sun's affect seems to be key, because if it's 80 degrees outside and cloudy, I don't have the issue--but, then again, I don't usually run the air conditioner if it's cloudy. As such, I'm not positive; but, this may be tied to when I turn on the air conditioner--as though the two share the same vacuum system.
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A friend brought me a car with the issue that the brake pedal sinks to the floor when braking. She said it was never low on fluid so I replaced the master cylinder and bled all of the lines with a friend pumping the pedal. The pedal would still sink to the floor. I tried vacuum bleeding the brakes and found that the front left consistently had large bubbles.
I Teflon taped the fitting on the calliper and the bleed screw which improved the problem but didn't fix it. I then replaced the calliper. The front left calliper still won't bleed and the brake pedal still goes to the floor. When I bleed it the regular way, the fluid comes out of the bleeder like it bled nicely. Neither of the rubber hoses that connect to the calliper have any visible damage. I had a friend pump the brakes while looking at the hoses and their is no bulge or swelling in them. Could the ABS need to be bled?
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My B6 purchased exactly three weeks ago has had a soft brake pedal since day one. By "soft," I mean that when parked with the engine running and applying moderate pedal pressure, the brake pedal provides some resistance but sinks to the floor. If I pump it up a few times, it temporarily gets much firmer, but eventually sinks to the floor again after a few seconds. Now the car so far has never failed to actually stop, and it can get into the ABS. But during an abrupt (okay...panic) stop last week, it did go to the floor while the car was still moving. That's when I decided that was enough and took it back to be serviced.
My expectation was that there was just a small amount of air in a line somewhere, and that they could bleed the system and fix it. That was my experience with my B5: it was very sensitive to the least little bit of air, and if it wasn't thoroughly bled after brake service the pedal often got mushy and could find the floor. But bleeding them always get the pedal back to normal. So the service advisor said that he "had the service manager drive [my car] and compare it to a new Passat [on the lot] and talked to "Quality Tech. Manager to confirm." And the confirmation was that my brake system is "working as designed." In short, they say the brakes are working properly and there is nothing to fix. So I have now picked up the car and it still does the same thing.
Now I can (and will) bleed the brakes on my own over the weekend. But I would like feedback from others as to whether or not their brake pedals regularly see the floor. I just can't see this being the way any hydraulic brake system should work..
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M friend with his 98 gmc. When stopping the breaks are normal until getting slow then the abs motor comes on and the break pedal sinks to the floor. The truck stops but the abs motor runs constant until you release the pedal. This is happening on dry roads. What is there to check before condemning the abs module?
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I have a 95 Accord EX, 4 cylinder with ABS. The brake pedal goes to the floor about once a month, all times of year (I'm in Minnesota). I had the brakes bled last summer, but that didn't work. The ABS light has been on for probably 10 years. When I talked to my mechanic he said the ABS system, even though it's not working, could be a cause of the problem because fluid is still traveling through that system. He said most likely a master cylinder, but no guarantees. He said it could also be one of the brake lines. About 120k miles on it. What are the odds that it's the master cylinder?
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yesterday i gave the 02 diesel a treat, 3 new calipers 4 new rotors, and semimetalic pads. the reason for only 3 calipers is the driver side was just replaced 2 months ago after it locked the wheel up on me. both rears were seized so i only had front brakes, and the passenger side front was leaking.
anyway, all new parts and the pedal is fantastic, besides the truck stopping again. this afternoon on the way home from the shop i stopped at a red light. breaks are rock solid. then all of a sudden, the pedal slowly sinks to the floor. but the brakes still hold. i get home and test them. again, pedal slowly sinks to the floor, but they hold. i am thinking still some air in the system, and park hte truck, with the intention of bleeding them again tomorrow.
i get out and see fluid all over the driveway. great. something in the front of the axle is leaking. the frame is drenched. whatever it is, is in front of the frame, on the engine side. what is in there, the ABS unit?
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I have a 2000 SCrew KR F150. A couple of weeks ago I noticed the brake pedal was slowly going to the floor while at a red light. I pulled over and popped the hood checked the fluid reservoir. It was full, so obviously no wheel cylinder issues or fluid loss. I haven't had a chance to tear into it yet.
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Ok, did an intake manifold cleaning on my 99 Accord the other day, and now I have problems...
Long story short, some time ago my car started to have a very rough idle. Took me awhile to find the problem. Turned out the air hose, between the filter and throttle body, had developed a big hole on the underside. So I replaced it and while I was at it used some throttle body cleaner, spraying into the intake manifold chamber. Lot of junk blew out the tailpipe. The car ran much better, but the idle could still be a little rough. I ran it that way for awhile, and finally the other day decided there was probably still some junk in there and it was time to really clean it out. So I took ff the throttle body and intake manifold housing. There was a lot of junk in there! The small intake on the passenger side was completely clogged shut. (I understand this isn't surprising on these cars.) I used a bunch of rags and 2 cans of Valvoline throttle body cleaner and a lot of elbow grease and cleaned it out. I was thinking to myself that whatever I didn't get with the rags flushed through OK, but I didn't want to take the whole intake manifold out.
So I put it all back together. (I took a video before I started, so I'm pretty sure it's all back together right.) But now I have problems. The car starts. It idles fine mostly, but can be a bit rough. But the trouble starts when I put the pedal down. If I do it in Park, well, if I push it quick the engine just dies. If I push it slow, the engine revs then quits, revs and quits, over and over. Similar if it's in gear. If I push it hard, the engine stalls. If I push it gentle, it revs up, but chugs along a bit.
I've run some seafoam through it, thinking it was clogged up with all that junk, and sure enough, lots of smoke comes out, but nothing is improving so far. What have I done wrong?
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1987 F-350 460 Auto Trans. Brake Pedal slowly going to the floor. Stopped at a red light yesterday on a slight down hill and I noticed the brake pedal slowly going to the floor. I had to put the truck in Park to avoid bumping into the car in front of me. I checked brake fluid level and still at the full level, check rims for brake fluid leak from brake cylinder, none. Could my master cyclinder need rebuilding or is my vacume diaphragm going. Not sure thats what its called.
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When coming to a hard stop and downshifting using engine braking, is it normal to have the brake pedal feel like it loses pressure to where the brake pedal pushes down further towards the floor for a split second? What causes that to occur?
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I don't know what's going on maybe some body can shed a little light on this. If you hold the brake pedal down for a long period of time you can feel the pedal slowly go to the floor. So no problem I'll change the master cylinder bleed everything brand new fluid. Don't drive it much we let the sister in law drive it we'll I jump back into it the other day to go to Home Depot and once again I notice it still does it. Could the hydra brake booster be bleeding by or what's else could be causing this it's driving me insane. I really can't imagine the hydra booster causing a problem but it's new to me. I was thinking about bleeding the brakes again thinking there maybe there's air but I have run 2 bottles of brake fluid through how much more??
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Today my car made a pretty loud thump when I put it in reverse and slowly let go of the brake. I haven't driven the car in 2 weeks. Afterwards, every time I brake there is a soft thumping sound that I can feel through the steering wheel, and the sound slows down with the speed of the car. I think I can also hear a very slight grinding noise while driving slowly in a quiet area.
I read in this forum to use the parking brake in an empty lot to see if its coming from the back tires. My question is, what was that loud thump in the beginning? Also, is it safe to drive to the mechanic (or can I fix it myself..)?
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We have a 2005 Toyota Camry, had it since 30K miles/2008, now has 94K miles. Since we have owned it, the brake pedal feel has not been great, kind of mushy. It is the way this generation Camry's are. It gets driven mostly on fwy, so not much brake use. At 92K miles I changed the front pads and rotors, pads still had 30% left on them. The rotors were somewhat warped. Brake fluid has been gravity flushed every 2 years since 2008, last one in 2012.
Now, the problem is when wife drives it, twice at a lengthy red light, she has noted that the brake pedal "almost" sinks. It did not go to the floor, but the level went lower. The car did not move during this events. With the newer ABS brake systems, on all my three cars, after a full stop, I can push the pedal down further, almost close to the floor. The Camry is the same way, just with a baseline of mushy pedals. My wife only drives one of the other ones (Dodge Caravan,)and has not complained about that one.
The brake fluid level is solid/steady, no leaks at the wheels either.
Now looking at whats involved, seems I can change the master cylinder myself. The question is do I need to? I don't mind paying a mechanic to do a diagnostic too, just not sure what they are going to do. I believe, just as a defensive measure, they will go ahead and change the MC (which then I might as well do it myself). I could also continue to drive it, but don't want to be stupid here.
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I am working on a e-150 van, 2005. the brake pedal fades to almost the floor with little pressure on it. I just replaced the master cylinder, bled the entire system, and it STILL fades to the floor. driving, or in park. engine running. 4 wheel disc, 4 wheel abs...
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I have a 2002 Honda Civic EX 1.7L. Recently the brake pedal would sometimes go to the floor when I'd apply the brakes. The car would still stop, but not as quickly as normally. If I apply the brake and it goes to the floor I would release the pedal and reapply the brake and it would stop at it's normal position and the brakes felt firm and the car would stop fine. I was told my problem was the master cylinder so I bought one on Sunday and replaced it. I bled the lines and it seemed like all the air was out. The brakes worked great and the pedal stopped in the same place and was firm.
Now today on my way to work the pedal went down a little farther than normal during one stop. On the way home it stopped in different places. The brakes would always grab and the pedal felt fairly firm wherever it stopped. I drove it this evening again and the pedal went to the floor like with the old master cylinder. One pump and they grabbed in the normal spot. What is going on? Did I not bleed the lines well enough? Is the new master cylinder just junk? I saw in the manual that air can get trapped in the ABS sensor, but an air bubble problem should just make the pedal squishy, not change where it grabs, right? I'm stumped and I really don't want to take my car in if I can fix it.
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2001 F-350 / 7.3L / 147K ... What are some symptoms of the master cylinder going out? And is there a such thing as a rebuild kit anymore? The pedal has been getting spongier & spongier over the past months. Truck still stops O.K. but you have to brake earlier than I used to. Pedal can go almost to the floor. Pedal continues to go to floor as pressure is applied. Does not go to floor though.
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I had the master cylinder change on a 92 honda accord EX the calibers change and, the master cylinder I have been told does not have any way to adjust the stem on the master cylinder so the brake man ajusted the brake pedal but the brakes are still freezing up. It is an automatic
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201w Routan SE 50000 miles. Past several months the gas pedal has gotten stuck to the floor four times. Always happens when going very slowly and romping on the pedal. Last time was today, 4/5/2016, when I was stopped at a round about and had to quickly accelerate as noone in our area knows how to navigate one. The pedal immediately stuck to the floor halfway around the round about and disengaged after I tapped on it. Hope this isn't a known issue cause I haven't gotten a recall notice for this piece of crap.
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I have a 1986 Honda Accord Hatchback Lxi, 180,000 miles, automatic, one owner, always excellent care (very recently new spark plugs, new air filter, new oil and filter, and several years ago new Pirelli tires). Lately, while driving, it intermittently loses power, like it's going to stall, but never does. I accelerate to recover. Years ago I used to hear about vapor lock. Last week I took it to a Honda dealer. They had no diagnostic machines for "old" cars and had no clue what was causing this. Most of the time, the car drives beautifully, but it's scary thinking it's going to quit and I'll be stranded on the side of the road.
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1991 honda crx si - starts fine when weather and engine is cold but lately giving me trouble starting when it is warm [above 80] and engine is cold [has not been driven for several hours].
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Our car starts, then dies. It starts fine, then dies. This only happens in warm weather, which we have finally been experiencing in Northern Illinois. It eventually gets to the point where we can drive it, but then might die at a stop sign, or it can go the rest of the day and not have any difficulties. I know later models have timing chains, not belts. Does our car have a timing belt problem or maybe fuel pump? And why only in warm weather?
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