Vacuum brake conversion - who has done it? - Page 3

FLR · 04-05-2008, 11:36 PM

Mine feel great in my car. If I hit the brakes hard enough, the car will go sideways with the S-10 cylinders in the back. Havent had one problem with the vac brakes on my car, and I believe they are the Master Power kit.

If I ever do have any problems, Im going HydroBoost. 1,400-2,000psi of brake pressure and it runs off the PS. Even if the engine shuts off, the accumulator holds enough pressure for THREE full stops. We'll see if I ever have to go that route though...

GrndNatnl · 04-06-2008, 02:57 AM

Scott, you need anti-lock brakes.

Scott GN231 · 04-06-2008, 09:25 AM

Quote:

Originally Posted by Madboost

B:

Manual might be an option... As long as you don't mind pushing pretty hard they work great, have great pedal feel, and are pretty cheap to go to. If it stalls there is no difference! Good for pushing the car around without a motor or trans.

I could seriously see doing this too, I wonder if different manual brake kits require different pedal effort? Seems like there'd be the opportunity to build in more or less leverage depending on the pedal is linked to the master cylinder.

Folks, is there a 'best' manual brake option? What are the trade-offs (if any) from different manufacturers.

The guy in this post provides part numbers for his Wildwood conversion.

Madboost · 04-06-2008, 10:46 AM

Side note, any time you take stuff off it cleans up the engine compartment too! No power master, no brake booster, very simple and not many parts.

GrndNatnl · 04-06-2008, 11:09 AM

Yeah, with manual, all thats there is the master cylinder. More room on the driver side of the engine bay is always nice. Would make that #5 plug change a breeze.

FLR · 04-06-2008, 11:25 AM

Quote:

Originally Posted by GrndNatnl

Scott, you need anti-lock brakes.

Slow91z · 04-06-2008, 11:52 PM

Quote:

Originally Posted by Scott GN231

I could seriously see doing this too, I wonder if different manual brake kits require different pedal effort? Seems like there'd be the opportunity to build in more or less leverage depending on the pedal is linked to the master cylinder.

Folks, is there a 'best' manual brake option? What are the trade-offs (if any) from different manufacturers.

The guy in this post provides part numbers for his Wildwood conversion.

The biggest thing that impacts pedal effort on a manual setup is the piston size...I never can remember which is easier and harder though.

J Banning · 04-07-2008, 12:00 AM

Quote:

Originally Posted by Scott GN231

I could seriously see doing this too, I wonder if different manual brake kits require different pedal effort? Seems like there'd be the opportunity to build in more or less leverage depending on the pedal is linked to the master cylinder.

Folks, is there a 'best' manual brake option? What are the trade-offs (if any) from different manufacturers.

The guy in this post provides part numbers for his Wildwood conversion.

Thanks for the link Scott.

A quick Google search turned up this:
Manual Brake Conversion
(Hint: For more info check out the two links mid-page)

I'll get the part numbers off Mike's master cylinder one day this week and look up the info on price/availability.

-Banning.

1of1547 · 04-07-2008, 07:23 AM

You saw the results of a powermaster failure @ Columbus. I will stick with my vacuum brakes.

GrndNatnl · 04-07-2008, 07:38 AM

Quote:

Originally Posted by 1of1547

You saw the results of a powermaster failure @ Columbus. I will stick with my vacuum brakes.

Who was that??

mjdwyer23 · 04-07-2008, 07:42 AM

GNX 258

87granny · 04-07-2008, 07:43 AM

That was a real GNX it was a topic on the other board a year ago from what i remember he was racing Bill Anderson and supposedly the PM failed

GrndNatnl · 04-07-2008, 08:00 AM

I remember hearing a little about that, but this is the first time I've seen that picture.

1of1547 · 04-07-2008, 08:02 AM

He was racing Bill. It is Sully's fathers GNX. As I heard it he went through the traps and hit the brake pedal and it was rock hard. He hit the sand and round bales @ 150+ mph. Thank God he had all of his NHRA safety equipment. He walked away from it with only his wrists wrapped up. Imagine if it would of happened at the GS nats.

GrndNatnl · 04-07-2008, 08:08 AM

Quote:

Originally Posted by 1of1547

Imagine if it would of happened at the GS nats.

I'd rather not.

That place is a safety joke.

04-05-2008, 11:36 PM	#31 (permalink)
FLR Buick Hypochondriac Join Date: Mar 2003 Location: Bear, Delaware Posts: 2,869	Mine feel great in my car. If I hit the brakes hard enough, the car will go sideways with the S-10 cylinders in the back. Havent had one problem with the vac brakes on my car, and I believe they are the Master Power kit. If I ever do have any problems, Im going HydroBoost. 1,400-2,000psi of brake pressure and it runs off the PS. Even if the engine shuts off, the accumulator holds enough pressure for THREE full stops. We'll see if I ever have to go that route though... __________________ Scott Jackson aka "ScoJack" MAGNA member & Meth supplier New setup: Limit TE-62, Dutt neck IC, ProTorque 32-3400 9.5" billet stall, PLX SM-AFR W/B, TT 5.6 chip... 11.480@114.99 w/1.58 60'* @ Cecil County 11.585@114.60 w/1.63 60' @ E-Town '94 Silvy K1500 Mudder Equipped Daily Driver, Neighbors hate IMCO at 1 in the morning...

04-06-2008, 02:57 AM	#32 (permalink)
GrndNatnl Risky Business Join Date: Jan 2001 Location: DeLand, FL Posts: 6,436	Scott, you need anti-lock brakes. __________________ Matt Alexander 1987 Grand National 11.35 @ 118.4 mph -- 1.50 60' Central Florida Grand National & T-Type Club Mid-Atlantic Grand National Association (MAGNA) Club Founder

04-06-2008, 11:09 AM	#35 (permalink)
GrndNatnl Risky Business Join Date: Jan 2001 Location: DeLand, FL Posts: 6,436	Yeah, with manual, all thats there is the master cylinder. More room on the driver side of the engine bay is always nice. Would make that #5 plug change a breeze. __________________ Matt Alexander 1987 Grand National 11.35 @ 118.4 mph -- 1.50 60' Central Florida Grand National & T-Type Club Mid-Atlantic Grand National Association (MAGNA) Club Founder

04-07-2008, 07:23 AM	#39 (permalink)
1of1547 All Go, No Show!!!! Join Date: Mar 2001 Location: Maryland Posts: 2,334	You saw the results of a powermaster failure @ Columbus. I will stick with my vacuum brakes. Attached Thumbnails __________________ Doug Martin, aka "D-HAM" Old Reliable, 1987 WE4 "Rat Rod" Best time 10.35@131mph with a PT54 New combo-10.58@131 with SMC Alcohol Tuned by Anderson Performance Maryland MAGNA Representative

04-07-2008, 07:42 AM	#41 (permalink)
mjdwyer23 Money Pit Join Date: Aug 2006 Location: Wilmington, DE Posts: 2,175	GNX 258 __________________ Matt Dwyer SOLD -- 1987 WE4, PT52, PTE front mount, 50 Lbs., 70mm TB/Hemco upper, Razor's Alky, THDP, RJC EVERYTHING! ATR stainless 3" exhaust, Test pipe with electric cutout, GN spoiler, Turbo Tweak chip, Scanmaster, 11.58@120 1.8 60' SOLD -- 70 Chevelle -- 427, solid roller, forged.

04-06-2008, 10:46 AM	#34 (permalink)
Madboost Registered User Join Date: Oct 2001 Location: NCC Posts: 333	Side note, any time you take stuff off it cleans up the engine compartment too! No power master, no brake booster, very simple and not many parts.

04-07-2008, 07:43 AM	#42 (permalink)
87granny Flyn Greek Join Date: Mar 2006 Location: mays landing nj Posts: 1,498	That was a real GNX it was a topic on the other board a year ago from what i remember he was racing Bill Anderson and supposedly the PM failed __________________ 1986 GN Mease 3' dp 009's TT chip ScanMaster underdrve pullys SMC alky Mikey's Trans not Monte Carlo Fast yet :

04-07-2008, 08:00 AM	#43 (permalink)
GrndNatnl Risky Business Join Date: Jan 2001 Location: DeLand, FL Posts: 6,436	I remember hearing a little about that, but this is the first time I've seen that picture. __________________ Matt Alexander 1987 Grand National 11.35 @ 118.4 mph -- 1.50 60' Central Florida Grand National & T-Type Club Mid-Atlantic Grand National Association (MAGNA) Club Founder

04-07-2008, 08:02 AM	#44 (permalink)
1of1547 All Go, No Show!!!! Join Date: Mar 2001 Location: Maryland Posts: 2,334	He was racing Bill. It is Sully's fathers GNX. As I heard it he went through the traps and hit the brake pedal and it was rock hard. He hit the sand and round bales @ 150+ mph. Thank God he had all of his NHRA safety equipment. He walked away from it with only his wrists wrapped up. Imagine if it would of happened at the GS nats. __________________ Doug Martin, aka "D-HAM" Old Reliable, 1987 WE4 "Rat Rod" Best time 10.35@131mph with a PT54 New combo-10.58@131 with SMC Alcohol Tuned by Anderson Performance Maryland MAGNA Representative

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