AmazingLo17

i own a 2004 mustang v6 , i didn't pass safety for my car because of the rear brakes my dad has changed my rear brakes and capilers and they stil don't pass. the problem is when the car is jacked up and i put it in drive then step on the brakes they just dont stop fast and still move with the break all the way down! any help is much appreciated we just can't fugure out what else to do. my dad is very experianced and has been doing car stuff since he was 13 but just isnt sure what else to do! any suggestions?

NeoTokyo

Heya, welcome to the forums.



Did you bleed your brakes correctly?

AmazingLo17

thanks! yea we have done that several times...any other ideas?

TomKat

proper amount of brake fluid?

3.8Cobra

I had a similar issue with mine, but half the problem was I blew a brake line. Either way, I found out, you can bleed the brakes once or twice and they can still be choppy. I'd sudjest doing it like one more time, then connect the bake line back then pump it about 10-20 times. It should firm up a bit. Mine just kinda fixed themselves after awhile.

NeoTokyo

Inspect your hard lines too, you might have a slightly dented line.


How does it feel when you drive?

Hard?
Spongy?
Normal?

l_shizzle_l

Your brake pressure should be somewhere around 200psi when the brake pedal is depressed. if that is good then check the mechanics of the caliper itself. You could also have a siezed caliper if the guide pins were not lubed and/or the pistion could be stuck as well

belairbrian

What happens with the emergency/parking brake set.

I replaced both rear calipers last year due to leaks. After that my car won't move when the handle is up.

Might give some insight into wiehter this is a caliper or hydraulic line issue.

Another possibility is a soft flexable line that is buldging.

Please describe "all the way down" are you saying the pedal goes all the way to the floor? With the brake pedal fully down how far from pedal to floor behind it?

AmazingLo17

it feels normal but because i was in a front end accident a year or so ago my dad is going to check the break line for a dent so thanks for that idea!
the caliper is fine
by the all the way down i mean as far as it goes down,not the floor but like an inch from the floor maybe...

gemini645

This may be the wrong place to post but here it goes anyway, maybe someone can answer. I have a 2004 GT, bought new calipers from Auto Zone, the left caliper is larger than the right. Is this normal? Thanks.