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Old December 2nd, 2008, 12:08 PM   #1
cheeperthebetter
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Default Brake Problem

I have an 89 Toyota P/U with a 3.0. Mostly stock except for 31" tires.
When i hit the brake pedal there is a little brake, then the pedal goes soft until it pretty much hits the floor where the brakes work a little but not very well. With the pedal on the floor the truck will stop at a normal stopping speed but nothing more.

I am thinking it might be a master cylinder but just wondered if there is anything else i should check.

Thanks
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Old December 2nd, 2008, 01:03 PM   #2
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Try pumping the brake, if it gets harder after a couple pumps, but still drops when holding pressure on the pedal, then thats probably the master cylinder.

Though, the way you describe it, it could be the booster.

But my advice only comes from my experience with Cheby's, so I dont know if the same symptoms can apply here.
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Old December 2nd, 2008, 01:11 PM   #3
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Quote:
Originally Posted by cheeperthebetter View Post
I have an 89 Toyota P/U with a 3.0. Mostly stock except for 31" tires.
When i hit the brake pedal there is a little brake, then the pedal goes soft until it pretty much hits the floor where the brakes work a little but not very well. With the pedal on the floor the truck will stop at a normal stopping speed but nothing more.

I am thinking it might be a master cylinder but just wondered if there is anything else i should check.

Thanks
Did you just do any work to them?
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Old December 3rd, 2008, 12:17 PM   #4
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Brekes hardly pump up. They get slightly harder but still act the same and still go to the floor.

I had the mastercylinder out of it last year but no work on the brakes recently.
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Old December 6th, 2008, 05:54 AM   #5
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couple guesses for what its worth -

Quote:
I had the mastercylinder out of it last year
has it been doing this since you had it out or it just started acting this way ?

if it developed on its own id vote booster like rebel said, if it was not right since you had it out then maybe the mc needs a bench bleed. wouldnt hurt to try anyway -

if youve got or can borrow a vac tester (mighty vac or similar) you can stick that on the booster, draw it down and see if it holds.
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Old December 7th, 2008, 10:46 AM   #6
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Are you leaking fluid under the truck anywhere? Do any of the lines look wet at all? Had the same problem a couple months back and it ended up being a bad brake line.
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Old December 7th, 2008, 01:21 PM   #7
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Was hauling stuff out of a flooded barn this fall after we got all that rain. Hadn't had any issues since putting the mastercylinder back in. Bench bled the thing last night, still the same. Guess i need to find a vacuum pump to check out the booster.

I can not find any fluid leaks anywhere, looked it over pretty well when it first happened. Reservoir is completely filled but i have only put maybe 20 miles on it since it started acting up. Don't really want to drive it on the road with bad brakes.

Thanks for the advice.
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