Question about Cadillac Eldorado

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Excuse me sir,My brakes hiss when i press the pedal. Also my brakes are very soft and the engine revs up when press the brake. I drive a 1985 Cadillac Elderado Biarriitz

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The brake booster has developed an internal problem, causing a vacuum leak which causes a rise in the engine rpm, repllacement is the only solution

Posted on Nov 06, 2010

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1 Answer

When I press the break and then release there is an air leak sound. What is the cause?


The brake servo or booster is divided into two chambers separated by a flexible diaphragm. Briefly there is vacuum on one side and pressing the brake pedal allows air to enter the other side and this is how the brake pedal effort is boosted.

The air enters via a filter through which the pushrod connected to the brake pedal passes. When the brake is applied the hiss of air entering the chamber will be audible; more on some models than others.
When the forces are balanced; when the brake is sufficiently applied no more air will be required and the hiss will cease. When the brakes are at rest; not applied there should be no hissing.

If there is it indicates a problem with the brake booster, perhaps dirt in the valve gear. Although repairs are possible they aren't very practical to carry out. A repair shop would probably charge more for fitting an overhaul kit than for replacing the unit.

May 11, 2016 | Cars & Trucks

1 Answer

My brake pedal will not budge, and a hissing noise present when running


The stop lights won't go out until the pedal is depressed, as there is a switch which is activated by the pedal.

A hard brake pedal is probably caused by a defective servo. The hissing noise is probably an air leak in the servo.

Switch the engine on, open the bonnet (the hood..) and see if you can locate the hissing - that'll probably be in the brake servo area.

If you don't know what a brake servo looks like here is a generic image:



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Jan 27, 2016 | 1989 GMC Sierra

1 Answer

Brakes


If the brake pedal has normal resistance when you press on it, the brake pads need to be replaced for $100 at a place like Brakes Plus, because the pads have become worn or glazed.

If the brake pedal feels soft and mushy, the same repair shop will bleed the air out of the brake lines with fresh fluid for $30.

Dec 07, 2013 | 1985 Honda Accord

1 Answer

Hi renault scenic 2l auto 2002. another common problem.


hissing noise is a leaking diaphram inside power brake booster.you have to replace the power brake booster.

Sep 18, 2012 | Renault Megane Cars & Trucks

1 Answer

Why would my brakes hiss when I step on them and cause the engine to rev up when I do this? It also makes the vehicle very hard to stop.


It sounds like your brake booster is leaking. The air hissing is the air going into the leak. This extra air goes into the engine and causes the engine to rev up. The booster is what makes it easy to push the brake, (when it is working correctly) which is why the pedal is hard to push.

May 31, 2012 | Chevrolet Blazer Cars & Trucks

1 Answer

SIr, I have a land cruiser 1985 BJ74, it has a brake problem, i have to press brake pedal with a reasonable of force to get it work, further my suv slightly turns to either left or right on braking....


Hi, it sounds like your front calipers need servicing, they are not working properly (seized/sticking)and it is quite possible that all your problems are related to your brakes, front brakes in particular, have your local mechanic look at them, it will be costly as you will find you will need new rotors (might get away just machining them), brake pads, reconditioning (if its servicable) brake calipers.

Feb 15, 2011 | 1985 Toyota Land Cruiser

1 Answer

All of a sudden my brake pedal is very soft, and makes a short hissing noise while being depressed. The hissing seems to be coming from that diaphram area above the brake pedal. The master cylinder is...


right, your booster diaphram has torn. You will have to replace the booster. Often this can be done without breaking the hydraulic system open. If you would like to do it yourself, let me know and I will send instructions.

Oct 27, 2010 | Ford Ranger Cars & Trucks

1 Answer

Replaced rear brake pads, now there is a hissing sound coming from brake pedal when i start it , come to complete stop and after i turn car off .what is the hissing or air pressure release sound coming...


There are 2 things that can use vacuum near the brake pedal. If you have cruise control, there is a safety switch on the pedal to shut off the curise when you apply the brake. This switch may be leaking.
The other part is the brake booster, which is actually in the engine compartment but bolts to the firewall, and your brake pedal mechanism pushes into the booster. You will need to get your head under the dash with the engine running and press on the pedal to locate the leak--on the switch or on the wall.

Sep 07, 2010 | 2004 Ford Expedition

2 Answers

1998 caviler when brakes are applied engine revs up


Hello;
Yoou most likely have a vacuum leak in the line from the booster to the intake. It could be a bad booster or check valve as well.
Thanks;
Rich
RPM Northwest

Jun 04, 2009 | 2005 Hyundai Tucson

1 Answer

Hissing sound from brake pedal of Renault Scenic 2001


Hi,
From your description this appears to be a Brake servo issue.
The brakes are assisted by a vacuum created from the draw off the inlet manifold, it gives assistance too the brake pedal pressure by a large tank/cylinder mounted on the Bulkhead/firewall.
I feel that the sound you a hearing is air being draw into the Brake Servo from the foot pedal seal and the reason for fluctuation in the engine is the vacuum from the inlet manifold is being upset.
Attention I suspect should be addressed to the Brake servo/pedal seal or gaitor.
I hope this clarifies your thoughts?
Please remember to rate my effort.
Paul 'W'
Onyer~EDSon(:0) {#><U.K.

Jan 22, 2009 | 2000 Renault 181

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