Question about Peugeot Liberte

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Front brakes sticking on almost every trip. New calipers new master cylinders,new hoses, new fluid new vaccum valve to servo, new vaccum unit but still happening Where's the problem !998 806 Eden Park

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  • Master
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A few items you could ckeck, adjustment of the pushrod from the pedal to the master [ if it's set to long, the pistons inside the master Cyl. wouldn't retact enough to let the fluid flow back into the master Cyl, properly causing the calipers to drag. this would become worse when the fluid and master heated up.], - The proportening valve may be faulty and blocking the fluid from returning to the master from the front brakes, - If the vehicle has Anti-lock brakes it could be in that system.
Good hunting!

Posted on Apr 08, 2011

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1991 PATHFINDER Does this car have a proportional valve and would this cause front calipers to lock up?


Need year make and model. In most newer vehicles the valve is located in the master cylinder. It will not normally lock up the front wheels. It usually controls one front and one rear wheel at a time in the event of a brake fluid loss. If front calipers are locking up you could have seized caliper pistons/slide assemblies. The flex hoses may be deterioated internally due to contaminated brake fluid or the master cylinder may be defective

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when you are done with a brake job it is always important to make sure you can slide the caliper both inward and outward by hand to ensure that there is no sticking, (that is with the pads in place and caliper piston completely depressed into the caliper) it is not rare to find that a piston that is very hard to depress back in the caliper is due to deterioration of the inner lining of the brake hose, if you have problems pushing the piston back into place most likely this is your problem. I have strong hands and is most vehicles I can push the piston back into the caliper by hand.

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replace the brake hose as they can collapse inside causing the fluid to be trapped and not allowing it to travel back to the master cylinder causing a line lock effect.

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Have a 99 Toyota camry n brake light is on after changing right front brake caliper


Master cylinder fluid piston has entered into a brake safe mode.
when the high pressure brake system is opened in any way, the brake master cylinder piston reaches to the far end of the master cylinder which trips the brake system warning light.

This brake light condition is due to sudden loss of brake fluid pressure on the right front brake caliper assembly during the replacement.

Left rear brake caliper bleed valve will ned to be "opened" until master cylinder piston travels into the opposite direction which "resets" the brake system warning light.

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Reference vehicle to owners manual for replacement fluid is replaced under master cylinder brake system cap.

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I had the same problem and replaced both calipers with no change, I figured it was the master cylinder. When I pulled off the master cylinder I saw the vacume booster had about 2 cups of brake fluid in it which leaked from the front of the master cylinder. I replaced master cylinder and vacume booster and brakes work great now.

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Just got new brakes new rotors on my front wheels The problem is that the drivers side brake is sticking. I took it back and they told me it needed a new 'caliper'. They put it in and it's still sticking?...


This may be caused by an internally collapsed brake hose allowing fluid to go to the caliper but not allowing fluid to return back to the master cylinder.

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I have a slow brake fluid loss. I think it may from the master cylinder. Are there any seals in the lines that go into the master cylinder unit.


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Peugeot expert van with stuck on brakes


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Jun 03, 2009 | 1987 Peugeot Liberte

1 Answer

Front brakes stick on


either your calipers are sticking and need replacing. OR the hoses have failed internally. and need replacing.. very rare but possible the master cylinder is not allowing the fluid to return usually caused bu a booster failing and causing some down travel in the master cylinder. I'd start by raising the front end up. appling hard brake pressure. turn the tire.. then loosen the brake bleeder to check for pressure. if the bleeder sprays fluid and the brakes release forget the calipers. if they are still tight then replace the calipers. pump them up again if they released.. and break the line free at the master cylinder. if they don't release then replace the hoses..

Nov 16, 2008 | 1999 Daewoo Lanos

3 Answers

Front brakes are sticking on and off on 2005 vibe,when the brakes stick brake pedal becomes hard??both sides start to heat up,calipers seizing?master cylinder problem?or?????


Ok Have you recently replaced the pads? Do they act normal after they cool down? Are the pads in good condition, pads that are so worn that the caliper pistons come out beond their normal limit may stick there due to excessively worn pads. If so make sure they are at least factory grade quality Good are bendix, the only thing that can cause your symptoms is a bad master cylinder because it affects BOTH front calipers equally if it was a caliper it is likely to affect only ONE. Let me ask you this happens after driving in heavy traffic or after along drive?
If So there have been countless cases of boiling brake fluid, Old Brake Fluid gathers moisture and its boiling point is lowered, Fluch out ALL the old brake fluid and have new put it.

also is there any chance even the slightest chance that something other than brake fluid even a drop or two is enough to do damage. has been added to the master cylinder at any time? If so you need to replace EVERY PART IN THE BRAKE SYSTEM INCLUDING THE ABS CONTROLLER THAT HAS ANY RUBBER PIECES IN IT CALIPERS HOSES WHEEL CYLINDERS,MASTER CYLINDER just for your information.
I believe you have a bad master cylinder but do not buy a rebuilt one only bran new and preferably from the dealer.
Please contact me if you need more help and would you give me a good rating if you feel my information is helpful.
Thank you ,Randy

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