Ford Brakes/Suspension :: F150 - Rear Brakes Lock Up Upon Hard Braking?
Jul 16, 2012
What would cause the rear drum brakes to lock up upon hard braking? I have replaced the wheel cylinders, installed new spring kit, and adjusters.
View 9 RepliesWhat would cause the rear drum brakes to lock up upon hard braking? I have replaced the wheel cylinders, installed new spring kit, and adjusters.
View 9 RepliesI have a 1997 F150, 4X4. My mechanic says its time for new brakes and was curious if it would be worth possibly converting from drum brakes to disc brakes??
My mechanic has quoted me $300 to do the rear brakes, would it be worth the extra money to convert??? I really don't care for drum brakes. I have done a search on the internet and every time it brings up the issue with the parking brake.
My rear brakes lock up constantly. It doesn't matter how easy I am on the peddle. The ABS goes through it's test on start up. Afterwards, the light goes out. The vehicle sat for quite a long time. I pulled the rear drums and inspected for rust and brake shoe condition. There was no rust to be found and the shoes seemed to be in good shape. I've read on here about some shoes retaining moisture and causing the same thing. These 'seem' dry. I've also read that it could be the RABS. Is there any testing to determine if the RABS is definitely the problem other than by-passing it?
View 9 RepliesI just replaced the front break pads. I didn't replace the rotors or get them machined, didn't look like they needed them. Once I pushed on the brakes (truck off) I noticed that brake fluid spilled out the brake reservoir. I'm guessing it happened when I compressed the piston into the caliper? I took some of the fluid out of the reservoir and now its at MAX (I didn't bleed them). I've only been only be able to stop and go on the driveway (I'm waiting on a new radius arm bracket). The brakes seems spongy, the brake hits the floor. ABS and Brake lights came on then turned off once I started to pump them when I turned the truck 'on'. Do I just need to actually drive and "break" the breaks in?
View 2 RepliesJust replaced break pads and rotors. Inner pad on left side was gone leading me to believe slides were not working properly. Pulled apart, cleaned and greased everything, and replaced pads and rotors. Calipers seem to be working fine. Now when I break hard, the truck pulls badly to the left. When I break softly, it seeks normal. My front end is a bit out of whack and veers just a bit to the left. Do you think this is my issue with the breaking ? I'm getting new tires and an alignment soon but was just curious.
View 3 RepliesI have a '99 E350 van that I am feeling a light anti-lock brake pulse in the pedal when I am rolling to a slow stop under light braking. Braking doesn't seem to be affected, but it doesn't feel right. I tried locking up the brakes and didn't feel any anti-lock pulse...seems backwards.
View 1 RepliesI have a 2001 F150. Front brakes replaced a few months ago. Last night, I realized my rear brake lights weren't working. I'm not sure how long they've been out or if it's related to the bigger problem.
While testing the brake lights by pressing the brake pedal, the pedal seemed to give out and sink lower. While driving the brakes worked but only when I pushed the pedal all the way in. Eventually the ABS light came on and stayed on.
Initially when I start driving, the brakes work just find. But it seems as I use the brakes, the front brakes build up pressure and slowly start to lock up. They don't lock up completely, but they do cause a significant amount of drag. The rotor, calipers, rubber hoses and master cylinder are all very new. I'm thinking maybe the issue is with the master cylinder and am considering going to get one along with a brake booster(since it doesn't have one currently).
View 14 RepliesI have a rough chatter noise coming from the rear end. It happens when starting off up till about 25mph. It rattles the cab a little and sounds real rough. It also happens when turning up hill, causes lots of vibrations in the cab. Some have mentioned it could be the rear differential needing a friction modifier or the u-joints needs some special lube? Its an 05 F150 with 62K miles.
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 RepliesI have this truck (in signature below) that I have not driven for ~3 years. As I am starting to drive it I am noticing I need to put A LOT of pressure on my brake pedal to get the brakes to work. They stop the truck and the pedal doesn't feel soft as if there is air in the line but it feels as if I apply a lot of pressure and there isn't a lot of grab.
While it might be possible, I don't think I have any type of glaze or coating on my brakes that would cause this. 95% of those 3 years, the truck was inside.
I wonder if it feels as if the truck is hard to stop because of the additional power I have coming from this new motor?
Is there any type of part I can replace in the brake booster to adjust the pedal? Or brake booster. Maybe that is going bad?
I have a 97 F250 that is having reoccurring brake issues, It has an intermittent hard pedal with little to no brakes when it occurs. It will stop but you are standing on the pedal with both feet. I have replaced the booster, master cylinder, and the vacuum pump in the past trying to isolate the issue and still had the problem. On this year model the abs ids only on the rear correct???? if it is shouldn't it only be affecting the rear brakes? Since this truck has a dual reservoir MC the front should still work?
View 4 RepliesI recently bought a beater '89 F-150 (I-6, MT) with the following problems:
1) Both rear brakes seem to stick on occasion--almost like there was a "check valve" on the rear brake line. When that happens, there is a "BRAKE" and "Rear ABS" light (although the light does occasionally come on without brakes sticking noticeably).
What I noticed in Haynes is that the "RABS I" system functions in the following way: a) Upon noticing rear axle spinning slower than front axle, it actuates a valve, isolating the rear brakes b) If the problem persists, it then dumps the pressure back into the main system.
So, I wonder: Is this an ABS system acting up? If I were to (temporarily) de-power the ABS setup, would it default to "no ABS," or would I need to remove the hydraulic valves from the brake lines? (Don't really want to if I don't have to.)
2) You can select either fuel tank, get that tank's level to indicate on the fuel gauge...yet it only "draws" from the front tank.
Again, Haynes says there is a low pressure pump in each tank, feeding a high-pressure pump in essentially a small "header" tank. The "dual-function reservior" has a wholly mechanical selector, and notes that "Tank switching versus gauge conflicts can occur under certain failure mode conditions."
So: I can understand that the mechanical selector can, in effect, "stick" on one tank. But what I don't understand is how it can still draw from the front tank, with the "rear" tank selected (and presumably, that tank's low-pressure pump trying to feed the header tank.)
Is it possible that the low pressure pump--while beneficial to prevent gravitation at the main pump--isn't strictly necessary to fuel the engine? Or do I have a problem with a low pressure pump that's "always on," regardless of the selected tank?
Two months ago, I replaced the rear drum shoes, wheel cylinders and seemed after that I was ok until today. I checked the rear brakes and they are split in half. i noticed my abs & brake lights lit up this morning. I would think the ABS is getting stuck? How do I check the ABS? This morning I felt like something was holding back the truck. I continued and when I got home I said to myself, let me just check the rear brakes and thais what I found. Both sides had the shoes broke.
View 1 RepliesBefore I get started... My truck is a 2006 F-250 Super Duty XLT 6-speed 4x4 with a Limited Slip.
I just got finished with a big job on my truck. New pads all the way around, turned rotors, new emergency brake shoes, hardware, and backing plate as well as replaced the rear wheel bearings both inner and outer as well as the axle o-ring and inner seal. Also, took off the rear pumpkin cover painted it and put fresh fluid in, went with Mobil 1 75W140 LS.
Took it for a drive and the brakes work great. Followed the directions for breaking in the emergency brake which worked fine.
Now the problem is I'm getting rattling from possibly all of the wheels. Definitely from the front driver and at least one of the rear wheels. It was so dark I didn't get a chance to look at it I just pulled it back in driveway.
I'll start looking at things tomorrow but, any common mistakes or things I should check first?
My dad has a 2008 F150 with just over 36K on the clock, and wouldn't you know it the ABS light came on. He's been a Ford guy all his life and excellent with a wrench, but has never worked on an ABS problem. BTW, this is the first problem he's had on his last 2 F150's.
I know we'll need to plug it up to a scanner. My question is can we plug up to the OBDII port or is there another ABS port we need to plug into, and will a regular scanner work, or do we need a special scanner?
I've got serious shake going on in the right front. I ordered new wheel bearings but can't figure out how to replace them. Been working on tractors, trucks, boats my whole life and this is embarrassing. '82 F150 straight 6, 4wd, standard trans.
View 4 RepliesI am having trouble big time getting air out of my brake lines. I put new front pads and rotors on and also had to replace the brake line coming from the caliper as it kind of crumbled and needed to replace the next line up that goes to the ABS block on the left front. After doing this, I bled that wheel only and at first it was ok until the brake line on the right front at the caliper also broke when I was pushing on the brake pedal with the truck running, spewing fluid all over. I have tried to bleed using a decent vacuum bleed setup from Advanced Auto but keep getting massive amounts of air coming out and when I start the truck and hit the brake pedal, it goes to the floor. Could the master cylinder be bad? I have checked every connection that I made and all other connections and there are no leaks at all. I am stuck in the garage! The truck is a 1999 F150 4x4 with 4 wheel ABS.
View 1 RepliesI recently purchased a mutt of truck, a 97' F150 heritage w/5.4 Triton motor, 1/2 ton 2WD short bed.
Having a brake issue, the pedal keeps fading. I noticed it first while sitting in traffic on a down hill grade. I am holding the pedal and notice it starts to creep down slowly, I pump it up and it firms up then starts collapsing again. So general logic says hydraulics are loosing pressure right?....No leaks anywhere, so it must MC tight?
I have replaced the master cylinder, brake booster, and both rear wheel cylinders. Long story short they all needed it, truck has 265K+ on the body with 95K on the motor. The only thing I did not do by standard is bleed the MC on the bench, I installed and long bled starting with the right rear working my from longest distance to shortest (wheel speaking). So when bleeding I did of course get air coming out because of the new parts but I still have the same fade issue.
I am confident there is no air in the lines, I have bleed a quart of brake fluid through just to be sure. I have read a lot about proportioning valves and ABS stuff.
I will try and get some vehicle specific photos and attach have hit a road block with this. I am leaning towards the ABS valve thingy mounted on the drivers fender that has four lines attached (2 in and 2 out). Other than that it comes down to hard lines which have no leaks.
I have a '90 F150 and both the yellow ABS light and the red BRAKE light are on.
It was fine until my buddy did a little brake work for me, including replacing a couple brake lines and a parking brake cable. He bled the system at the lines going into the front calipers because the bleeder valves on the calipers where corroded and frozen. I then replaced the calipers and bled the system properly. Three times. I don't think the problem is from the brake work.
The brakes still work, by the way. The pedal just feels a bit spongy and I think the brakes don't work as well as they could.
If the truck is not running, I can pump the brakes a few times, and it will make a sound like it's sucking air a few times. Then the sound stops and the pedal firms up.
If the truck IS running, it keeps making the sucking air sound no matter how many times I pump it, and the pedal feel stays the same. I think it might be a bad brake booster.
I took my 2010 F-150 for brake job and ended up with brake fluid in intake!! How that happened?
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