Question about 1994 GMC Sonoma

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Brakes went out

I have to step on my brake super hard almost to the floor in order for my truck to come to a stop what do i do

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You most likely have a leaking power brake booster unit, here is how you test it, run the engine for a few moments, then after turning it off press on the brake pedal a few times, if it sink and then gets hard to push the booster is working, if no change the booster is defective.

Posted on Oct 06, 2008

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Power brakes stopped working


Brake booster vacuum hose , inspect that, if the hose is good then brake booster has went bad.e1320de5-8a99-48ed-84e9-c42d2e2274cb.jpg

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Hi oakleafwoodw, sounds as if the brake master cylinder has busted a seal allowing the brake fluid to leak by cylinder when you push the brake pedal giving you no or very little pedal pressure....it is located under the hood on the drivers side firewall, you will see all the brake lines attached to it , remove those and the two bolts holding it on,take it with you to auto parts store for a rebuilt one , they will keep your core for rebuilding, other wise you pay a core charge., verify that they have the one you need before hand, get a quart of dot 4 brake fluid, hook it up, and bleed air from the brake lines starting with wheel cylinders in this order Right rear......left rear.....right front.....left front...making sure to keep fluid level topped off in the master cylinder during the whole bleeding process or you will pump air into lines....OK!! caution: you should not drive it until you have good brakes!! you said they still work but if you had to stop suddenly ,it won't do it.

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1 Answer

I changed the front rotors and brake pads once i was done i started the truck and the brake pedal went to he floor and the dash ifo said to service brakes. since than the brakes have been hard and...


It went to the floor because you had to compressed the piston to get it over the new pads and rotors. The brakes need to be pumped up after you replace pads in order for the pistons to come back in contact with the new pads and take up the gap. Pushing the pedal to the floor is never a good idea and a good way to ruin a master cylinder in older vehicles.

As far as the pulsation, have the rotors turned. Make sure the wheels are torqued to the proper spec when you are done (140 lb/ft). Pump up the pedal when you are done and you should have smooth braking.

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You might want to google recalls on the internet.
( http://www.recalls.gov/nhtsa.html )

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Chk. for vacume to booster, or loss of vacume like a break in vacume hose, do you hear a hissing noise when you step on break peddel. If you don't hear anything chanses are its the booster. When peddel gets hard to push you either lost vacume or booster went bad.

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