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| Big brake Booster and M/C upgrade - What parts exactly? (Page 3/3) |
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Monstertone
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JAN 28, 07:27 PM
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| quote | Originally posted by Blacktree:
It will reduce pedal travel, at the expense of increased pedal effort.
[b]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 wieaken the rear brakes.[/b]
l w
That said, a bigger booster can't hurt. It will give you more vacuum assist. |
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You need to compensate for that mismatch in volume between the front & back calipers. That is what proportioning valves are for. Some are adjustable, some are not. You need to be careful upsizing the booster unless you have a bigger engine that will make more boost. And hot cams cost you because of valve timing overlap. You can get buy with it if you're not on the brakes all the time.
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olejoedad
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JAN 29, 12:57 PM
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Or you could install GrandAm
/Beretta calipers and rotors on the rear and return the balance to the system.
And spend less money that putting stock Fiero parts on the front.
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lou_dias
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JAN 30, 10:25 AM
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Meanwhile everyone forgets about the 1982 Corvette MC...
Before I "upgraded" to my super heavy racing wheels, I used to be able to put my head thru the windshield with 255's...[This message has been edited by lou_dias (edited 01-30-2020).]
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Dennis LaGrua
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JAN 30, 03:46 PM
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Use this larger brake booster
Larger Brake Booster
Then purchase the brake booster rod end adapter from Rodney Dickman ,reuse the Fiero brake booster bracket to attach and you're in business.
I have read all the comments like this booster won't work right with the stock Fiero brakes but my experience proves otherwise. By just changing to this brake booster the braking action on my 87GT has improved 100% . I just installed one on my 85GT with similar results.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 01-31-2020).]
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Blacktree
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JAN 31, 12:53 PM
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| quote | Originally posted by SP1200:
Foot travel distance to lockup point.
Pressure needed to reach that point.
Rears not locking up at all.
Fronts locking up too much. |
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The stock brake proportioning valve has a significant front bias. Putting larger bore calipers in front, while keeping stock calipers in back, exaggerates that bias. Also, the larger bore master cylinder can push more fluid through the system, which is good for larger calipers. But it comes at the expense of reduced line pressure, which is bad for the stock calipers. All those things combined create a worst-case scenario for rear brake performance.
There are a couple ways to approach that problem:
1) Tinker with the prop valve (at your own risk), to adjust the brake bias.
2) Install rear calipers that match the front calipers.
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wftb
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JAN 31, 02:20 PM
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https://youtu.be/t6yoGEkoQmg
Posted by member liv4god (sp?). A very good demonstration of the results using just a booster. If you haven't already seen it.------------------
86 GT built 2.2 ecotec turbo
rear SLA suspension
QA1 coilovers on tube arms
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