i think that my rear brakes are stronger than my front brakes, i noticed this when i went to do a burnout and my car would move forward and die down, i just thought it was i sucked at doing a burnout but jumped in my friends rx7 and did one no problem, i let my friend try it in my car and he said that the back brakes were gripping more than my front, what would i need to do to fix this? the previous owner did get new oem rear rotors before i got the car but i dont think that has anything to do with it, any suggestions so i can get this fixed so i can do a sweet burnout lol

and my car has ABS delete if that helps at all

88 rx7 turbo 2

 

That's a pretty unscientific way to come to the conclusion that your brakes are insufficient. Perhaps you just need a bigger turbo

Regardless, we can't do much for you over the Internet. I would suggest cleaning out your diverter valve (mine was gunked up and would not pass fluid through one of the ports) and also do a pad/rotor swap. The rotors could be glazed over, the pads could be crap, you basically have no idea what you're getting into.

 

go into an big empty lot, get up to some speed and jamb on those brakes- let us know how the car reacts

assuming you have already inspected your brake rotors for even wear to make sure they are fully biting down

 

my rear wheels locked up

 

did you inspect the front brakes for even rotor wear?
if the car was controlled when the brakes locked up and there is even wear on the front rotors and the rest of the system hasnt been messed with maybe consider a matched set of front and rear pads, maybe new rotors all around too.

 

Jack up the front of your car, have someone apply the brakes and see if your front calipers are grabbing at all.

 

if not grabbing he should see significant more rust on part of the rotor

 

in racing, the FC does have a big rear bias, ie the rear locks up first. there are a few things to check first, and then you can try changing things.

stuff to check;

1. do you have decent pads all the way around?
2. are the front calipers stuck?
3. if its freshly bled, sometimes the rears get hard enough that you can't bleed the fronts. i like to bleed the front first, it makes a difference.
4. are the wheel bearings loose? a loose bearing will let the rotor wobble, and this pushes the pistons further into the caliper, which usually makes the brakes feel soft.

if those things are all ok, next step is to put a more aggressive pad in the front. after that you can put an adjustable proportioning valve in there, although that is kind of a race car part

 

maybe if everything checks out just leave well enough alone, the car seems to be ok besides you and your friend trying to do a burnout

 

I tried the rear pad swap with crappy ones and rear bias is still too much
Fronts are aramid

 

I've had the proportioning valve cause all sorts of issues before. it malfunctioned and acted like a check valve by not releasing enough pressure. I'm sure it could cause other issues too, like not distributing enough pressure to the front calipers.

 

Unless it's clogged, the prop valve can't restrict pressure to the front circuit...it's not physically possible.

If the rear bias is as pronounced as the OP claims, I'd guess the master cylinder is at fault.

 

if on a budget you can probably overhaul that whole braking system for under $500, considering the age of the car it might be in your best interest to do that

 

problem solved, bled the brakes. there was air in my front brakes

 

aye aye aye this is almost as bad as the guy wondering why his car was vibrating with is tires that were missing threads

always check the basics first if brakes that they are fully engaging and that there is no air in the system

 

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