I replaced my MC cap and gasket less than a year ago with a Dorman replacement and I'm leaking again, already. I don't want this to be an annual thing! Any good quality replacement? Is there any tip or trick to get the gasket to seal better?
View 9 RepliesMy 2003 Toyota 4 Runner with 104K miles recently started showing a brake light off and on. The brake fluid reservoir was at the minimum level and there was some residue leaking from the bottom near a silver disc. Took it to a mechanic and was told it was most likely the master cylinder leaking brake fluid. Is this normal wear and tear or is it unusual in this vintage vehicle? I do not notice any brake slippage at this point. Should I take this to the dealer and ask why this master cylinder is faulty? I thought Toyotas were long life vehicles?
View 2 RepliesI have power steering fluid leaking out of the bottom of the Brake master cylinder out of a round hole. Every time I pushed brakes it leaks a good amount of power steering fluid out. Why it would do this and is there a screw missing out of the hole or what?
View 6 RepliesI replaced my hydroboost unit about 10,000 miles ago. Today I noticed it was wet under the unit. Only this time, it's not red PS fluid, rather, it is brake fluid. So, I assume the master cylinder is leaking and winding up under the hydroboost unit via gravity. Or at least that's my theory.
Any way Rockauto lists 2 motorcraft master cylinders.
One is BRMC-26 for Hydroboost
The other is BRMC-27 for speed control.
I have obviously Hydroboost, but also have speed control.
Vehicle is an '86 Comanche 2.5L. Tested the battery at standing and charging, came to 12.8 standing and 14.7 charging. The alternator relay clicks, though that doesn't necessarily mean it's in good working order.
Any electrical load applied; headlights, taillights, hazards, blinkers, etc. kill the engine.
The clutch master cylinder is leaking onto the fuse box, though I moved it as best I could as I don't have the funds for a new master cylinder right now and I'm not sure which fuses, capacitors, and relays do what on the fuse box as the writing is barely noticeable.
Early 70's Ford truck. The brake MC fluid is filled but not overfilled, and doesn't leak at all when the truck is parked. It can sit there for a month and never leak a drop, parked. But when I drive the truck, even just around the block, then park, and look inside the engine compartment immediately the brake MC is dripping brake fluid. It appears the leaking mode is by the fluid somehow jumping up and coming over the top edge of the MC when the truck is in motion or when the brakes are applied. All my diy'er years of replacing brake master cylinders on Ford Galaxies, VW Rabbits, Corollas, and this truck, I've never seen this kind of weird brake problem before. On this MC design it seems there's sort of a rubber baffle inside the lid of the MC, and that's present and accounted for.
View 17 Replies...Is there anything special that needs to be done for brake bleeding after putting in a new master cylinder? I decided today to flush my system with my vacuum bleeder and now my pedal slowly falls to the floor at a light...No problems in a panic stop or otherwise, just falls to the floor slowly when braking...no leaks, so I'm assuming a master cylinder is an order....
View 14 RepliesWhy the brake lines have 2 or 3 coils in them near the master cylinder? Makes it a real pain to work on anything down in that area. Always snags ratchets and stuff...
My brother and I were discussing it the other nite, and the conclusion we came up with was, the first guy ever who was installing a brake system had tubing that was a couple feet too long, and couldn't find a tubing cutter, so he coiled them up.
Then the next guy saw that and figured "hmm, so THAT'S how it's done", and so on... Kinda like the story about the lady who always cut off both ends of her ham before she put it in the broiler..
I tried to replace my brake master cylinder today but wasn't able to because of a plug
It's the black plug on the drivers side, the connector is upside down so I can't see how to unplug it I tried for an hour then got too frustrated I had to come inside
My Haynes manual says "unplug" obviously
ll, I changed out the master cylinder on my 2002 F-150, disk brakes front and back w/ ABS. Bleed all the air out and bench bleed the master cylinder. I have good pedal but the brake light will not go out.
View 6 RepliesMy son's 2006 F-150 4x4, with 107,000 miles, has in intermittent brake light on. I replaced the rear pads, as they were nearly into the rotors. The brake pedal feels fine in all braking conditions. Could the master cylinder still be going bad? Anything else to check?
View 4 RepliesI have a 79 f150. I changed two brake lines and master cylinder and bleed,and more bleed,but still very soft all most to floor? wheel cylinders look good.
View 2 Replies1987 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.
View 14 RepliesI have replaced the cruise control cut off switch and post-recall pig tail twice in two years for fluid leaks. Whats the deal do they all leak?
View 6 RepliesWhat kind of brake line is it and if is replicable with regular brake line? I'm just replacing long line between front and back splitter block and just would like to know what is it. What is purpose of that braiding (?) at front brake lines and why they wind down instead of going straight. Part of that long line is braided too, part that go across frame.
View 3 RepliesI replaced the master cylinder 2 months ago and now every now and then the rear lock up for a second. its only happened a couple of times. Pulled the wheels and everything is in place with nominal wear with clean drums and rotors. Am at a loss as to why this is happening.
View 1 RepliesStopped after a hard pull and noticed I had coolant dripping off the front sensor on the Brake Master cylinder. Coolant level was down in the Degas bottle. Searched everywhere for the source of the leak, and couldn't see anything. Today the drip had stopped, but when I squeezed the rear heater return hose under the Degas bottle it appeared to have a wet spot form.
I'm thinking I have a very tiny pin hole, and plan on pressurizing the system to see if I can determine for sure this is where it is. Before I do though, where this high pressure leak might be coming from? Degas bottle and cap is less than a year old. Doesn't appear to be any signs of leaks around the clamps. That rear heater hose.
I have replaced booster, master cylinder, all four callipers, and bled the brake system a number of times on my 2000 F-150 4x4. and still the pedal is wicked spongy, is there some other problem?
View 6 RepliesA few years ago I (for him) replaced all 4 calipers, rotors, pads, etc....things were good. Just recently he replaced his Brake Booster and Master Cylinder (not sure what led to this), but long story short everything is back together and he doesn't have brakes.
My GUESS is that the system needs a good flush, new fluid, etc....
My problem is I'm unsure how to bleed the ABS system. A few google searched indicate I need a scan tool, but is there another way? Can I jump something.
So my question, how do I completely bleed the brake system on this truck?
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.
View 4 RepliesWhich line goes to front brakes and which to rear from the master cylinder?
View 1 Replies