As i am still very new to fieros, this forum has been such a big help!

So i am wondering if anyone has bought new rear and or front brake calipers from rock auto?

If so, then what are your recomendations?

This is for an 88 GT 2.8L

Also are there any differnces in the 87 GT breake calipers than the 88?

[This message has been edited by the_snowman (edited 03-15-2025).]

84-87 use the same calipers. The rotors are not vented

88 calipers were only used on the 88 Fiero, no other GM car used them.
The rotors are vented, therefore they are thicker that the pre-88's.

88 calipers are very hard to come by.

Are your 88 calipers not working?

ohhh, okay.

yes, my calipers on all four are not working.

with some work they can be fixed, but i have a time limit on how long i can work on my fiero.

it is currently at a friends garage, and he would like it out asap.

quote Originally posted by olejoedad: 84-87 use the same calipers. The rotors are not vented 88 calipers were only used on the 88 Fiero, no other GM car used them. The rotors are vented, therefore they are thicker that the pre-88's.

The 88s also have a different caliper bolt pattern, as well as offset side to side and radially.

I've run front calipers on all four corners on my 88 Formula for quite some time with no issues.

Most members want a working parking brake...

quote with some work they can be fixed, but i have a time limit on how long i can work on my fiero. it is currently at a friends garage, and he would like it out asap.

IF you have good '88 cores; see this thread:

1988 rear brake options by Dave Deerson
https://www.fiero.nl/forum/Forum2/HTML/148372.html

------------------
Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles

[This message has been edited by Vintage-Nut (edited 03-15-2025).]

So if i would like to keep the parking-brake, then i would need to rebuild them?

The rear piston actuator / parking mechanism is the 'key'...

Some remanufacturing business fails from the box and members reported lots of horror stories about getting crappy rebuilds.

Do you have ANY fluid coming out of the center hole of the rear piston?

[This message has been edited by Vintage-Nut (edited 03-15-2025).]

No fluid from the piston at all.

quote my calipers on all four are not working.

Say more; 'why' they're not 'working'?

Did you bleed the lines, and you have a 'problem'?

[This message has been edited by Vintage-Nut (edited 03-15-2025).]

What i know so far is that the wheels can move semi freely,

When the brake petel is depressed the brakes do not apply more or less after it is relesed.

The calipers have surface rust ( from what i have seen so far ) witch do not let them relese form the rotor.

When i blead the breaks and manualy tried to move the brake pads to put more force on the rotor and vise versa the pisoton would only push the brake pads onto the rotor, and not pull back when it should.

that is so far what i know.

I bet your sliders are 'dry'...

IF the piston WILL move WITHOUT pads; grease the sliders.

Do you have the 1988 Pontiac Fiero Service Manual?

https://fieroinfo.com/manua...o_Service_Manual.pdf

[This message has been edited by Vintage-Nut (edited 03-15-2025).]

The piston still moves, but it only moves forward whn i manualy do it with my hands.

Not with the brake pedel, so i am a bit confused.

do you think it is worth my time to take the caliper apert and rebuild it?

or it there an easy fix to this problem, if it is the caliper at all?

9 I do have servus manuels for the 88 and 87

[This message has been edited by the_snowman (edited 03-15-2025).]

Did you bleed the lines - Yes or No

Do you have pressure to clamp the pads to the rotors - Yes or No

I did bleed the lines - Yes

I did not have pressure when i did it with the pedel - No

i did when i too the break lines off and the spring off and manuely tried top see if it did - Yes

[This message has been edited by the_snowman (edited 03-15-2025).]

quote I did not have pressure when i did it with the pedel - No

Remove the master cylinder, bleed the master cylinder on the bench to verify IF the master cylinder will push fluid from both ports....

IF NO; get a new master cylinder and bleed it on the bench BEFORE installing it.

See "bleed a brake master cylinder on the bench" on the internet

Will do, Thank you for your help!!

also thank you for putting up with my lack of knowlage!!

You're welcome...

When you have a working master cylinder on the bench and ALL the air purged, install it WITHOUT getting any air inside....

Before installing the working master cylinder; clean the calipers and grease the sliders

Also read in the manual 'how' to rotate the pistons into the calipers before installing the pads

[This message has been edited by Vintage-Nut (edited 03-15-2025).]

Will Do.