Question about 1999 Cadillac DeVille

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Brake pedal very hard to push - 1999 Cadillac DeVille

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I would start by checking the brake vacuum booster, the booster is what make the pedal power brakes and easy to push, also take a look at the master cylinder for leaks at the rear of it as the fluid leaks out the rear it goes into booster and destroys the rubber diaphram.

Posted on Jul 21, 2010

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Posted on Jan 02, 2017

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4 Answers

Why is it hard to push on the brakes


The most obvious cause for a hard pedal is simply not enough vacuum. Check the brake power booster by pumping on the brake pedal while the car isn't running. Continue pumping until you've "bled off" the vacuum from the booster. Hold the pedal down while you start the car. The pedal should go down a bit more beneath your foot. If it doesn't, then you should examine the connection between the vacuum hose of the brake power and the engine's vacuum.
Replace the brake power booster if the connection's fine, which would fix the hard brake pedal problem.

It may be your calipers need replaced. Check them for signs of wear. Look at the metal spring where the brake pads sit.
Apply tension to the pad and see whether you hear a pop. If you do, the brake pad is moving too much on the bracket. Replace the caliper. This could help the hard brake pedal.

Jul 09, 2014 | 2000 Isuzu Rodeo

1 Answer

Why is it so hard to apply brake pedal?


_______power brake booster, check vacuum to booster and the check valve for brake booster. primary symtom is high hard pedal that requires greater then normal pedal pressure to stop car. testing booster= pump brakes several times with engine off to deplete stored vacuum. turn on engine with pushing slightly on brake pedal. you should be able to feel the pedal fade away a bit, and then become firm. But not hard. if you feel nothing at the pedal when engine starts. Brake booster is not working. Good-day! make sure vacuum is going to booster with engine running. it may just be a bad vacuum line or check valve.

Apr 30, 2014 | 1984 Buick Skyhawk

1 Answer

Stop lights wont stay on when i step on brake pedal on 2001 expedition


I had this same problem (brake lights won't come on when pushing on brake) I found that the brake light sending unit had come out of adjustment.Look under the dash by the brake pedal.There is a plastic threaded unit that needs to be pushed back towards the brake pedal lever.Careful not to push it to far or the brake lights will stay on. Hope this helps

Nov 12, 2012 | 2001 Ford Expedition

1 Answer

Brake pedal hard but sitll braking


the brake booster will make the brake pedal hard to push. they get that way usualy when they loose there vacume. if you dont hear a vacume leak with engine running then i would start with replacing the booster

Jul 25, 2012 | 2000 Oldsmobile Alero

1 Answer

In order for me to be able to brake the car, I have to push really hard the brake pedal, the pedal does not go all the way to the floor but I still need to push it hard. The four shoe brakes have already...


EITHER YOU STILL HAVE AIR IN BRAKE SYSTEM OR YOU HAVE FAULTY BRAKE MASTERCYLINDER.IF BRAKE PEDAL WAS GOING TO THE FLOOR FIRST OF ALL AND BRAKE FLUID WAS NOT LOW.MOST LIKELY BRAKE MASTERCYLINDER IS FAILING.

Sep 05, 2011 | 1999 Mercury Sable

1 Answer

When i push on break pedal its hard to push down and there is air leaking from down by pedal


need to replace the power brake booster. the vacuum diaphragm in the booster has bursted causing the noiseand the hard brake pedal.

Aug 03, 2011 | Chevrolet 1500 Cars & Trucks

2 Answers

My break pedal is hard to push & i can here air when the peadel is pushed into stop, and is this connected to the abs if there is one on my model.. thanks for your help. would this be the brake...


not sue u have abs on that model
more than likely break booster
best way to check booster is stop truck pump pedal a few time then put your foot on brake pedal and push down this is with truck stopped ,keeping pedal pushed start engine brake pedal should move down more if booster is working check all pipes tp booster

Sep 29, 2010 | 1995 Toyota 4Runner

3 Answers

Hard brake pedal hear air leaking when pedal pushed


When you press on the brake? Have your brake vacuum assist checked. It,s that bigspaceship looking thing between the brake master cylinder an firewall. good luck and be safe.

May 25, 2009 | 1999 Chevrolet Tahoe

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