Question about 2001 Pontiac Sunfire

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What can be causing the rear brakes to lock up? This happens usually only after a rain.

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You need to have, or clean and adjust the rear brakes yourself if you wanna do it yourself, remove the wheel, and brake drum sometimes you have to tap on the drum with a hammer, and of course can't have the ebrake on. after the drum is off spray the inside of it, and the brakes with some brake cleaner available at any parts house until clean. then take sand paper, and scuff up the shoes and inner drum surface reassemble and it should be good for a year or 2 unfortunately its the nature of the beast replacing brake shoes with high quality expensive shoes does help though

Posted on Sep 10, 2010


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When driving or starting the car i notice when using the brakes it makes a squeaking noise - not all the time think its possibly damp causing it as it was raining yesterday and it happened but no rain...

To address your first problem squeaking brakes aka "brake squeal", is most often casued by one or 2 things: "Pad vibration" or a "low brake warning sensor".

Pad vibation is usually caused by ineffective pad anti-rattling clips & hardware that allow the pads to vibrate at a super fast speed whenever the brakes are applied, thus causing a high pitch brake squeal. To correct this, replace all the pad hardware and anti-rattling clips and make sure you use a quality pad set that has anti-rattling plates attached to the backs of them. Weather conditions do affect brake squeal, that is why it seems to be worse at times.

Low brake warning sensor squeal occurs when your brake pads reach the point of replacement, the sensor attached to the pads scrapes on the rotor which produces a high pitch squealing sound to warn you it's time for new pads.

As far as your second problem goes (a knocking sound), I'll need more information about the problem before I can offer a possible cause (eg. happens on left or right turns, while going over bumps, at high or low speeds, accellerating...).

Sep 22, 2011 | 2001 Ford Focus

1 Answer

Rear left tyre is locked due to constant rain and wet crossings. Have taken wheel off and tapped but still not released. Any other suggestions. Have also locked and unlocked handbrake to no...

I think you will find that the brake shoes are locking the wheel due to the wheel cylinders not being able to return fully. On trucks that use hydrolic brakes you can find a small wheel type adjuster in the backing plate. Usually 1 per cylinder and theres often 2 cylinders per wheel. Try to de-adjust the wheel cylinders to free the wheel. This wil only allow the wheel to turn. After a brake aplication u might find the wheel is back to the original situation. So i suggest removing the brake drum and investigating further.

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My rear brakes grabbing on 2000 sunfire need help

Grabbing drum brakes are usually caused by moisture on the shoes. This can be oil, water, brake fluid, ect. Most likely unless it's been raining really hard for a while you probably have a wheel cylinder leaking brake fluid and they will need to be replaced.

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Rear brakes dont grab enough! non ABS and brakes will not lock up, either with peddle or e brake!

A few possibilities exist: Your rear brakes may be binding (rusted pistons)
but usually that will affect one side more than the other. More common reason is that the master cylinder is bypassing or air has gotten into the rear half of the system. (usually the pedal won't feel "right" if either happens. If the pedal feels normal I'd look at the porportioning valve. If that fails, it will not permit pressure to reach the rear brakes.
As for the e-brake, they are really not designed to lock up but depend on vehicle weight and motion to cause them to hold. In the past they were used as a "fail safe" in the brake system. presently they are more used as a "hill hold" to keep pressure off the transmission and shift linkage when the vehicle is parked on a hill.
First make sure nothing in the brake assembly is binding and preventing full engagement, and that there is no air in the system or a master cyl problem, then check the valve.

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1 Answer

Rear brake lock up

If you have drum brakes on the rear and I am pretty sure you do, and you had to remove the drums you will need to adjust the rear brakes back to the point of almost touching the drum while jacked up and spinning the tire. Not to tight. The brakes are probably traveling so far to hit the drum that they lock up. This will be more noticeable when raining or damp weather. Hope this helps.

Feb 08, 2010 | 1994 Chevrolet S-10

1 Answer

Back brakes lock up

There are several conditions that can cause this to happen. You want to start out by checking the parking brake assembly, particularly the cable for the right rear or passenger side brake. Make certain the cable moves freely when the park brake is applied and released completely when the park brake is disengaged.
Next, remove the rear brake drum and check for any oil, grease or brake fluid contamination of the brake shoes. Any contamination of this type will cause the brake to hang up when applied.
If that checks good, make sure the brake system hardware if working properly and components have not dislodged from there installed position be sure there are no broken return springs or very rusted and weak components.
Generally what happens is a wheel cylinder begins to leak, contaminated the shoes and cause them to become sticky when the shoe contacts the drum or a return spring breaks or comes off for various reasons.
Check it out and let me know.

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1 Answer

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It sounds like your rear brakes needs to be service. Your brake shoes are worn too thin or the retainer clips are broken holding your brake shoes in the right place. Good luck

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You might have some brake hardware thats fell off Or they are adjusted up way to high..Or another probable cause could be the emergency brake is hung up.Hope this helps you in finding your problem.Have A Great Day..

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Check the front brakes!! Dollar to donuts, your prob is up front! Frankster016

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