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Old 11-25-2010, 11:11 PM   #1
xAimz
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Default MkIII brakes dont work

I have a 1991 supra, and im having problems with the brakes.
when i press the brake pedal it goes all the way down, and doesnt seem to slow the car down. the guy that i bought it from says it might be the master cylinder.
Is there a way i could find out exactly whats wrong, could it be the master cylinder or do i need to bleed the brakes.
what Dot brake fluid does mk3 use?
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Old 11-26-2010, 02:58 AM   #2
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Sound like master if it was air in the lines the pedal would feel Spongy
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Old 11-26-2010, 03:12 AM   #3
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Our Supra's use Dot 3 brake fluid. Try bleeding the brakes first. Air in the lines doesn't always result in a spongy pedal. While you are bleeding the brakes, inspect the rubber brake hoses at each of the wheels for any splits or cracks. Move them around a bit and make sure they are still flexible. Brake hoses are often neglected, and therefore a common failure point on 20ish year old cars.

If the brake lines are in good shape and bleeding the brakes does not fix the problem, remove the master cylinder and bench bleed it. If that doesn't fix it, then that is likely your issue.
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Old 11-26-2010, 03:24 AM   #4
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i remember my first master cylinder, was on my 85, and i didnt know what a bench bleed was, had to take it off and bleed the master, dam that was a mess...
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Old 11-26-2010, 03:29 AM   #5
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Yeah, it's a PITA but you can rarely get away without doing it. I got lucky on a Jetta, never again though
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Old 11-28-2010, 01:19 AM   #6
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Is there a certain order to do it?
some say it doesnt matter, some say to do rear R, rear L , front L then front R.
do i also gotta disconnect negative?
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Old 11-28-2010, 01:39 AM   #7
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Start with the longest line first and so on.
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Old 11-28-2010, 03:13 PM   #8
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were the brakes recently changed on the car before you purchased it?

what happends on older vehicales (happened to mine)
is when you change the brakes the peddle goes down to the floor. the peddle fallowing the same range of motion, over time anything beyond that gets dried out. so your basically overextending the piston in the master cylinder and rupturing one of those o rings. happens, can be rebuilt. but buying a new one for 60 bucks, why go through the hassle. Mc w/ ABS

good technique to put a block of wood behind the peddle so it doesn't hit the floor. but if you replace your master cylinder this shouldn't become a problem again for another 20 years.
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Old 11-28-2010, 03:40 PM   #9
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I have no idea, the brakes are crossed, are those stock?
like the car WILL stop, but first you gotta push the pedal in, then pull out then pump again for them to work.



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Old 11-29-2010, 01:13 AM   #10
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the brakes are crossed??.. are what stock??

first things first is to bleed the brakes. then see if its the mc. dedicate an hour and you can get it solved.
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