Question about Mercury Cougar

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Cannot keep pedal up on Front Brakes

Have replaced brake parts including the master cylinde rand still cannot get the pedal to stay pumped up.
It will pump up but then the next time you put your foot on the pedal it is down to the floor and has to be repumped again..

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Have you bled all of the air out of the system, starting at the furthest wheel from the master cylinder, then working toward the closest?

Posted on Sep 11, 2009

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The front drivers side break keeps locking. I have replaced the caliper and now when I pump it no fluid is coming out from the line.


Did air get into the master cylinder? If you can, try bleeding the master cylinder. The fact that you aren't getting any fluid out of the line suggests that the master cylinder isn't pumping fluid.

Master cylinders are (usually) on a split circuit system - that is, the front left brake is on the same line as the rear right. The front right brake is on the same circuit as the rear left.

A point to be aware of is when bleeding brakes/doing brake work and if the master cylinder runs dry, is that a seal inside the master cylinder can fail/twist over and not pressurise that particular line, even though it may pressurise the opposite brake line.

I'm in the UK. I have a 1998 Jeep Grand Cherokee 4 litre, which I am slowly rebuilding. Three weeks ago I fitted new front brake rotors, new front callipers and pads. I've been rebuilding cars for over 40 years now and have done countless brake overhauls.

.. and could I get a hard pedal after the job was completed? I must have bled the brakes three times a day for a week and couldn't get a brake pedal. I phoned a full time mechanic I know - he came and tried to bleed the brakes three times and couldn't get a hard pedal.

That's when you think 'The master cylinder was working before I started the job so it must be still working now'.

I fitted a brand new master cylinder and because some parts for older jeeps are hard to come by in the UK, I fitted a second hand proportioning valve. When I bled the brakes again the pedal became rock solid. Fixed.

You're probably fed up with your braking problem now ... and apparently this 'no fluid/brake pedal' is more common than you may think.

Try bleeding the master cylinder if you can. If you suspect that it isn't fully working - try an overhaul kit which is cheaper than a new master cylinder.

As for changing the proportioning valve .. that's your decision. My brakes now work though the truth is I don't actually know which was at fault as I changed both the master cylinder and proportioning valve at the same time. Maybe both were at fault, for whatever reason. I genuinely don't know.

The positive aspect is that you are doing your own work and know what you're doing. You're saving on labour charges.

Apr 18, 2016 | 1998 Dodge Grand Caravan

2 Answers

Why are front brakes staying engaed


1. The master cyl has a valve that maintains a small amount of pressure on the brake fluid to keep the caliper pads close to the rotor otherwise you would have to pump the pedal to get the brakes to work. If you think the front brakes are too tight.. try opening the bleed screw on the back of the caliper and see if there is any pressure there after this condition happens. or jack the truck up and try turning the tire/wheel. This will only work if the problem exists when you try it.

May 19, 2014 | 2004 Chevrolet TrailBlazer

2 Answers

I am trying to bleed my front brakes and I keep gettting air in the line. when everything is shut and I pump the brake I hear air in the master cylinder. does that mean it is the master cylinder? 1978...


you have to keep master cylinder topped up as you bleed brakes
start at the furthest wheel from master cylinder slow pumps on the pedal holding down as your companion opens open bleed nipple'if your doing it yourself open bleed screw and fit small tube over nipple and put tube into small container half filled with brake fluid and just pump pedal yourself goodluck

Mar 24, 2011 | Chevrolet K2500 Cars & Trucks

1 Answer

I have replaced all brake parts including front brake hoses and let all the brake fluid to drain out of the master cylinder. Went to bleed the brakes and it appeared to bleed all air out of the lines etc.....


U forgot to bleed the BRAKE MASTER! When ur bleeding the brakes, make sure ur engine is RUNNiNG. I f u haven't got any BLEEDiNG tools that sucks all the fluid in ur car, try Bleeding first the master, 2nd will be the front wheel brakes, and the REAR brakes! If everything FAiLS go to ur nearest garage and have them fix it! Drive slowly, using ur engine and hand brake! Hope that helps u out!

Nov 17, 2010 | 1990 GMC S-15 Jimmy

1 Answer

We have replaced the master cylinder and a square


When bleeding brakes you start with the wheel farther away from the master cylinder, this pushes air and fluid to the master cylinder. then the same with the next farther. Keep an eye on the fluid level in the master cylinder.

Jan 23, 2010 | 1998 Oldsmobile Achieva

1 Answer

I have replaced the front brakes and right front 98 ford tarus.


typically if you pump the brakes and it gets harder by each pump the master cylinder is good.Check all calipers for leaks,and rubber hoses..still no signs of leaks then open the bleeder screws on both front calipers and let them drip for about 15 minutes,and keeping the resivoir full of fluid..tighten the bleeders and pump them up..hopefully they work and all it was is a little air in them still.

Dec 13, 2009 | 1999 Ford Taurus

3 Answers

Brakes are still spongy after changing the pads, one caliper, and master cylinder. bled front brakes.


I just went to Brake Masters this morning and had them replace the Master Cylinder since I was experiencing the pedal very spongy and going to the floor. When they replaced the Master Cylinder and they gave me back the car, the brakes were still spongy and going to the floor. I addressed this to them and they took another look at it, but when I took it for a second time, the brakes were extremely spongy. It was almost like they gave me back my car in worst condition to when I brought it in. Can you help?

May 21, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

SOFT BRAKE PEDAL ON MY DAEWOO


MAKE SURE THE ARE NO OTHER LEAKS.IF U DID NOT BENCH BLEED THE MASTER CYLINDER BEFORE U PUT IT ON U PROBLEBLY HAVE AIR IN THE SYSTEM.BLEED THE MASTER CYLINDER AT THE LINES THAT COME OFF OF IT.THEN U NEED TO BLEED THE REAT OF THE BRAKES IN THIS ORDER.RIGHT REAR,LEFT FRONT,LEFT REAR.RIGHT FRONT.WHEN BLEEDING THE BRAKES WAIT 15 SECONDS BETWEEN PUMPS OF THE BRAKE PEDAL.IF U GO TO FAST U CAN DAMAGE THE MASTER CYLINDER.GOOD LUCK

May 01, 2009 | Daewoo Leganza Cars & Trucks

1 Answer

Unable to bleed front brakes


loosen the front brake line that goes to the master cylinder fill master cylinder up with fluid and bleed it first by attaching a flexible line from master cylinder front brake side submerge that line into jar of brakefluid keeping air from entering line get someone to pump brake pedal while ur holding line in a jar keep refilling the brake resivoir so no air gets in, once the master is bled front brake side then reattach the origional brake line then remove bleed screw from caliper and let fluid gravity flow down to calliper then bleed the normal way. more than likely your master cylinder has air trapped in the front portion good luck

Jul 01, 2008 | 1996 Chevrolet Blazer

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