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Why do I have brake fluid coming out of the vacuum brake booster in my 1995 yukon after collapsing the calipers

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The master cylinder seal is bad. (seal between master cylinder & booster) Common GM problem as they age.

Posted on Apr 01, 2011


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2 Answers

How to diagnose a bad brake boosterOn my 95 GMC Suburban K 1500 4 x 4 5.7 v8

Hi, your basic symptoms will be. Your brake pedal. Will be very hard to push. When the pedal is engaged there will be a large vacuum leak, usually causing the engine to be very ruff or stall. If its bad enuff, youll hear the the air leak when pedal is depressed, hope that helps.

May 02, 2016 | GMC Cars & Trucks

1 Answer

I have replaced 3 of 4 disc calipers on my pt cruiser. I have bleed brakes on all 4 calipers and have good brake pedal until I start the car.When I start the car the brake pedal goes to the floor.

Are you loosing brake fluid after you tighten that bleeder screw back? Your brake booster helps aid in the vacuum of the car - if you have an internal issue with that brake booster - you should check any vacuum lines coming off that booster. If you can answer with your year, make and model I can get you a more in depth answer - there are other things that can be causing your issues as well - from the master cylinder to other things. Good Luck. There's also a way to test that brake booster - do you have a pressure/vacuum gauge?

Jan 24, 2016 | Cars & Trucks

2 Answers

Hard brake pedal

You can only have whatever the engine vacuum is
at any time.
Is there vacuum to the booster check valve
& is the valve working,assuming you have the
old one or a new one with the new booster.
Does fluid flow out all 4 corners?
Are the Rubber Flex Hoses Collaped
Calipers Rusted & frozen?
Did you remove the master & clean out
the moisture from around the piston
That is where you start,then flush & on to
every component in the system, if they are
on the vehicle for many years
You do realize brake fluid gets changed every
2 years on all vehicles or you got big problems with
moisture in years to come

Jul 18, 2013 | Cars & Trucks

1 Answer

I have a 1995 K1500. I have had every part of the brake system replaced and still no brakes. when I stump on them it feels like your pushing on a brick wall, then they leak down to almost the floor be

That hard pedal is a sign of a vacuum leak on the brake booster.Check the vacuum hose on the booster for holes and with the engine running have someone push the brake pedal while someone else watches the hose to see if it is collapsing when the brake is applied.If it does that will be your problem.Replace the 3/8 vacuum booster hose.It will have to be the thick hose just for a vacuum booster or it will do the same thing if that is what is wrong.

Jan 21, 2012 | 1995 Chevrolet K1500

2 Answers

Brake Booster problems

You may have a bad booster, but when your brake pedal goes all the way down, you have no fluid, a bad master or really bad calipers

Oct 01, 2017 | 1985 Chevrolet Monte Carlo

1 Answer

Brake pedal go's to the very bottom and slow stopping

A few different things to look at. Either you have a bad master cylinder, master cylinder and booster, brake Caliper/calipers.

Look under the vehicle on inside of the wheels, if you notice any fluid on your tires then it is coming from the caliper piston leaking. They have rebuilt kits, but its way easier to just install new calipers.

Look in the engine compartment on the drivers side on the firewall, you will see the master cylinder with 4 lines running from it that it will look like this jgwhomeequip_0.jpg

Look at where it attaches in the back, if fluid is leaking in the back then you need a new booster. To be honest with you, since it has to do with brakes, if you are not mechanically inclined I would leave it to a professional. You can call a mobile mechanic to do the job usually about 50% cheaper on there labor rate, but just as experienced or you can tow it to a shop.

Jun 19, 2011 | 2002 GMC Yukon XL

1 Answer

Would like to see brake digram of 1995 ford f-250

Item Part Number Description 1 2B120 Disc Brake Caliper 2 2140 Brake Master Cylinder 3 — Manifold Vacuum Source 4 2365 Power Brake Booster Check Valve 5 2005 Power Brake Booster 6 13480 Stoplight Switch 7 2455 Brake Pedal 8 — Fluid Level Indicator
(Part of 2L454) 9 11572 Ignition Switch 10 2261 Rear Wheel Cylinder 18fb197.gif

Mar 10, 2010 | 1995 Ford F250

3 Answers

Brakes west very hard, now it's very tough to brake. Any thought's on what could cause this? Brake fluid seems to be good.


Did you check the viscosity of the brake fluid? Also, please check the brake booster and the vaccumm hose. It might be leaking or even disconnected.


Aug 28, 2009 | 1998 Volkswagen Golf

1 Answer

Service brake booster display

Your brake booster is the heart of your power brakes. It runs off a vacuum from the intake to booster. Your brakes will still work as long as they have fluid. They'll just get stiff. It probably means you need a new one

Mar 31, 2009 | 2004 GMC Yukon

1 Answer

Brakes aren't working. put in 3 cans of brake fluid, can't find leak but fluid disappears. what next?

Try pumping pedal with booster vacuum line disconnected at booster,
check if any fluid at vacuum connection.
Do this with engine not running.
Please let me know if pedal goes hard and fluid at vacuum port
, if so booster is faulty

Aug 01, 2008 | 1995 Jeep Wrangler

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