Question about 1993 GMC Safari

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Leak in brake system of 1993 gmc safari

I appear to be taking in air from somewhere in my system and I think I may have a fluid leak somewhere. When I am driving sometimes the brakes will cease working or, at best, the pedal will go to the floor.

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Check Brake line above Gas tank i own a 1993 Gmc van to brakes were doing same thing didnt appear to be fluid on grown but when lifting it up and sticking hand up on tank you could feeel the line rusted threw Gmcs Are known to leak rite above gas tank

Posted on Oct 30, 2009

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I have no brakes


When you say that the first master cylinder had no pedal, did that just suddenly happen?

A master cylinder has rubber seals inside - think of a bicycle pump - when the bicycle pump seal wears it becomes difficult to pressurise it. The same is true of a master cylinder.
A classic sign of a master cylinder with worn or perished seals is that it needs pumping a few times to pressurise but there is no leakage of brake fluid.

Prior to you changing the master cylinder had the level of the brake fluid dropped .. indicating a leak somewhere? Had you done any work on the brake pads/rotors?

Eliminate other causes of air getting into the braking system:

First thing to do is check the flexible brake hoses on each wheel. Get a friend to pump - and hold - the brake pedal while you inspect the flexible hoses. Check for leaks (obviously) but also look to see if each flexible hose 'bulges' anywhere along its length.

25932867-jil1jjwvkur0lkeilf3pe4be-4-0.jpeg Also check each flexible hose to see if it is perished or wet with fluid. 25932867-jil1jjwvkur0lkeilf3pe4be-4-1.jpeg A perished flexible hose can draw in air and cause no pedal/spongy pedal. The same is true with a flexible hose that bulges/balloons when under pressure.

It only takes a slight 'weeping' from a flexi hose or rigid pipe connection to allow air into the system. Check the rigid brake pipes too - especially where there is a connector/join.

Then remove the road wheels and look for the slightest fluid leak around caliper pistons.

The problem, I think, comes back to the original fault .. no pedal when your car had sat overnight. This is rather indicative of air getting into the system somewhere though not necessarily from the master cylinder.

Check for the slightest leak in the entire braking system. It only takes a small amount of air to get in and cause problems. The fact that you fitted a second master cylinder makes me think the problem could lie elsewhere.

Try bleeding the braking system. It's a 2 man job, but quite easy.
Here's a link that explains how to do it:
How to Bleed Your Brakes

Good luck!

Oct 30, 2015 | 1988 Plymouth Reliant

1 Answer

Brake line replacing cost


Under $50 depending on how you do it. Just don't use compression fittings. The are fine for fuel and other systems, but they are NOT approved for use on hydralic brake systems

Nov 04, 2013 | GMC Cars & Trucks

1 Answer

03 gmc safari leaking brake fluid around radiator


If you don't know something or work on
your own vehicles, then you need a repair shop

Mar 21, 2013 | 2003 GMC Safari

3 Answers

1997 GMC safari van brakes do not operate correctly when pushed. They did not stop the van until the brake pedal was pushed numerous times.


AT FIRST GLANCE I WOULD BE LOOKING @ BRAKE FLUID CHECK LEVAL AND REAR WHEEL CYLNDERS MAY BE LEAKING, OR MASTER CYLNDER BYPASSING

Nov 16, 2011 | 1997 GMC Safari

2 Answers

I am working on a 1993 f-350 with a 7.3 diesel the truck came to me with the brake pedal going to the floor... the customer had already put 3 new master cylenders on it along with a new brake booster......


I would ask where you got the master cylinders from. Were they new, or rebuilt? If the front brake pads look good and no apparent problems from the calipers, it can only be 2 problems. First, is there a leak somewhere in the system. If you have confirmed that there is none, then the master cylinder is 'bleeding' from front to back. Air wouldn't be a problem as you seem to have bled the brakes well, but the only sure way to know is using a bleeder. They run from a simple hand vacuum device to an air powered device which forces brake fluid thru the system.
Since your 'customer' replaced the booster, make sure the plunger rod is set correctly. Perhaps it is not set at the correct length, in which case you will never get a pedal. Diagnosis for this is a pressure tester to see if any pressure is being generated by the calipers.
Good luck. Hope this helps.

Sep 22, 2011 | 1993 Ford F350

1 Answer

Paddle is too soft and if put hard brake it did not stop


you have air in the lines either your brake fluid is really low or work was done on the brake system and air was able to get in. also check all the lines and make sure there is not a leak somewhere this would also allow air into the system. You will need to bleed the brakes to remove the air once you have determined that the system is leak free.

Mar 27, 2011 | GMC Envoy XL Cars & Trucks

1 Answer

Soft pedal almost goes to floor


If you mean your brake pedal than you have air in the lines either your brake fluid is really low or work was done on the brake system and air was able to get in. also check all the lines and make sure there is not a leak somewhere this would also allow air into the system. You will need to bleed the brakes to remove the air once you have determined that the system is leak free.

Mar 26, 2011 | 1993 Dodge Dynasty

1 Answer

Brake fluid is expelled from the top cover of master cylinder when brake pedal is depressed why?


Brake fluid from the Master Cylinder leaks if the Master Cylinder is leaking itself otherwise the leak is somewhere else, have some one check this out, it could be anywhere and you should have seen some drops on the floor by now.

Sounds like a "stuck" caliper piston. Many Chrysler products (by example) used "phenolic" pistons in the calipers which were notorious for seizing in the caliper. Replacement pistons are usually made of steel. With the piston seized heat builds up and ruins the seals in the caliper.

You could have a blown master cylinder that is leaking from the back and into the booster area. Take the cylinder loose from the booster and see if there is fluid in that cavity. Sounds like a massive leak. Look at the rubber hoses and metal lines. The reason you cannot pump up the brakes is because the leak is allowing air to re-enter the system so that pressure cannot build up.

Also, this article could help to check it: how-to-fix-a-brake-fluid-leak

I hope helps (remember to rate and comment this).

Oct 03, 2010 | GMC Sierra 1500 Cars & Trucks

2 Answers

No pressure when I brake.


I would suspect there is either a crack in your brake line. the fluid has to go somewhere if youre having to refill the reservior. Maybe they didnt bleed them after the work was done, and had an air bubble and when you applied pressure is blew out a fitting. needs to be checked out though for sure!

Oct 26, 2009 | 2004 Pontiac Sunfire

1 Answer

Any one know how to build an evac system for brake bleeding


no i don't but i think the best way to bleed brakes it to let them gravity bleed them selfs out! works great for me! take the brake fluid reservoir cap off and open one bleeder at a time let the fluid run out of it till you see no more air! if it won't come out leave it open get in the truck depress the pedal till it does then leave it open till the air is out and repeat for the rest! make sure to keep an eye on the level of the fluid in the resivoir ! good luck

Sep 18, 2009 | 1993 GMC Jimmy

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