Brake pedal is rock hard HELP

ls1mbj · December 08, 2002, 11:12:33 PM

Just purchased a 90 tgp and the brakes are rock hard and it does not stop at all any help would be great thanks in advance

turby · December 09, 2002, 07:10:45 AM

If the car sat for awhile the calipers could be froze up. Or the PMIII could be shot.

Chris A · December 09, 2002, 05:32:58 PM

Even if the calipers were frozen it shouldn't have a hard brake pedal. Chances are the PMIII isn't running, which could be for several reasons. Check the fuses in the left side fuse center for the abs. If they are ok, check the abs fuse in the glove box. Then you will need to check the pressure switch and relay.

oh, here go more updates on the PMIII.....[/list]

idbeast · December 12, 2002, 08:40:31 PM

sounds like the fuses to me, and Chris has already explained where to find them, thanks Chis... :drinking:

ls1mbj · December 22, 2002, 02:31:51 AM

the mechanic i took it ot said the brake booster/ball? is bad and its not worth fixing because the part cost more than the car is worth ,can this be true i hope not !!

turby · December 22, 2002, 07:24:10 AM

He must mean your PM III unit is bad. Depending where he priced it from it could cost as much as $1200- $1600. Prior reman sell them for just under $500 with $100 core. Chris A. has all the info on his website.

www.turbogpgarage.com

Chris A · December 22, 2002, 11:13:48 AM

He could mean the accumulator too. But that doesn't sound right. Even if the accumulator was dead, it would still make boost pressure, the pump would just be running all the time. It could be that the accumulator being dead has worn out the pump motor to the point that it draws a high amount of current and blows the fuses. Either way, it sounds like your best bet is to get a new powermaster, instead of wasting money on an accumualtor to find out there are other problems.

Tell him not to insult your ride either, he must not know what he's working on.

turby · December 22, 2002, 11:23:27 AM

Quote from: Chris ATell him not to insult your ride either, he must not know what he's working on.

I was thinking the same thing.

ls1mbj · December 22, 2002, 05:04:57 PM

Chris A does the $500 reman unit come with every thing i need i dont want to buy it and find out it needs more ,and thanks for all your help

turby · December 22, 2002, 05:29:44 PM

The only thing you have to use off your old one is the wiring harness including the relay.

ls1mbj · December 22, 2002, 05:36:59 PM

that doesnt seem to bad then ,mechanic wants 200 to install, is that a fair price ,hopefully its the fuses but i doubt it thanks

turby · December 22, 2002, 05:44:26 PM

If you have any mechanical abilities, replace it yourself. It only looks really hard. If you get on Chris A's website he has instructions on swapping them. When I first looked at mine it half scared me shitless thinking of changing it. I ended up doing it myself with NO problems. I'm one that will try to do anything to avoid paying a mechanic for it.

Chris A · December 22, 2002, 06:03:25 PM

Doesn't sound bad for the install, but I would do it yourself. Its really not very hard, and you don't need any special tools. Try the suggestion of leaving the lines loose at the MC and bleeding there. Doesn't always work, but can save some time.

If you don't want to do it, I would print off what I have online and show it to the mechanic. I'm not trying to doubt anybody's ability, but few people are familiar with this ABS system. He may appreciate it. If it were me changing it and I didn't know anything I would. Even alot of books are not right about this system, I've already noted quite a few errors.

Chris