Big brake Booster and M/C upgrade - What parts exactly? (Page 1/3)
SP1200 APR 26, 05:45 PM

I hear "early model 90s" big booster and MC form the S10 works good on the Fiero, but exactly what year?
Is there any options out there that doesn't require smashing the fiero inner fender wall?
Blacktree APR 26, 06:12 PM
Are you installing bigger calipers? If not, then a bigger master cylinder will actually reduce braking power.

The S10 booster will increase braking power, but requires "percussive adjustment" of the sheet metal.
Lambo nut APR 26, 06:16 PM

quote
Originally posted by Blacktree:

"percussive adjustment"



LOL, I like it!
SP1200 APR 26, 06:59 PM

quote
Originally posted by Blacktree:
Are you installing bigger calipers? If not, then a bigger master cylinder will actually reduce braking power.
The S10 booster will increase braking power, but requires "percussive adjustment" of the sheet metal.



Wouldn't installing a bigger M/C decrease the amount of brake pedal travel and increase response? Maybe I'll try just the boster first.

I installed Bretta Calipers & Rotors on the Front about a decade ago. Not sure if the are large than the OEM pre-88 Fiero.

I'm just really tired of almost crashing when I change form my daily BMW driver and take the Fireo out for a drive. The difference is like night and day. I almost rear ended someone today while driving through a yellow light. The car in front of me decided to stop suddenly. I'm know comparing the Fiero to a BMW is not fair, but I'd like to make it as close as possible.
olejoedad APR 26, 07:48 PM
Have you fixed the mismatch in caliper piston size yet?
That is your primary problem, it must be fixed before you do anything else to your brake system.
Members here have (some anyway) given you very good advice to get your brake system back to good performance, you should heed their advice.
Blacktree APR 26, 09:28 PM

quote
Originally posted by SP1200: Wouldn't installing a bigger M/C decrease the amount of brake pedal travel and increase response?


It will reduce pedal travel, at the expense of increased pedal effort.

Since you have Beretta calipers in the front and Fiero calipers in the back, you're in a weird place where you need more fluid volume for the front calipers, but up-sizing the master cylinder will weaken the rear brakes.

That said, a bigger booster can't hurt. It will give you more vacuum assist.
pmbrunelle APR 26, 10:21 PM

quote
Originally posted by SP1200:
I'm just really tired of almost crashing when I change form my daily BMW driver and take the Fireo out for a drive. The difference is like night and day. I almost rear ended someone today while driving through a yellow light. The car in front of me decided to stop suddenly. I'm know comparing the Fiero to a BMW is not fair, but I'd like to make it as close as possible.



Just put a bit of muscle into it. Stock Fiero brakes should be able to lock the tires.

Manhandle the Fiero; it's not a fragile iPhone that you touch with your fingertips.

I would suggest returning the front to stock. The others have mentioned this already, but if you hear it from another person, you may believe it more.
SP1200 APR 27, 01:45 AM

quote
Originally posted by olejoedad:

Have you fixed the mismatch in caliper piston size yet?
That is your primary problem, it must be fixed before you do anything else to your brake system.
Members here have (some anyway) given you very good advice to get your brake system back to good performance, you should heed their advice.




Thanks Ole, and I understand what your saying. Someone will give me some advice, I will feel on track...then it will spark a debate and other members will chime in with what they do/dont do...and I feel just overwhelmed. I'm considering manufacturing some lines, and installing a jegs/summit replacement adjustable prop valve.

See thread: http://www.fiero.nl/forum/F...134638.html#lastpost

I also wanted to get the part number info on the booster and MC so I can order all the parts.
I think with a jegs prop valve and a good boster, it should give me the results I'm looking for.

[This message has been edited by SP1200 (edited 04-27-2018).]

SP1200 APR 27, 01:46 AM

quote
Originally posted by Blacktree:

It will reduce pedal travel, at the expense of increased pedal effort.

Since you have Beretta calipers in the front and Fiero calipers in the back, you're in a weird place where you need more fluid volume for the front calipers, but up-sizing the master cylinder will weaken the rear brakes.

That said, a bigger booster can't hurt. It will give you more vacuum assist.



OhhI see. Good explanation. Thanks.
I will just go with he booster for now.
SP1200 APR 27, 01:56 AM

quote
Originally posted by pmbrunelle:


Just put a bit of muscle into it. Stock Fiero brakes should be able to lock the tires.

Manhandle the Fiero; it's not a fragile iPhone that you touch with your fingertips.

I would suggest returning the front to stock. The others have mentioned this already, but if you hear it from another person, you may believe it more.




Maybe I'd go back to OEM if I can get some decent vented or cross drilled rotors. I remember the brake fade issue was just to much for me back in them old days. Would hate to go back in time.