Master cylinder help

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Yellowchevelle
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Master cylinder help

#1 Post by Yellowchevelle » Mon Nov 17, 2008 10:07 am

Im taking the stock brake booster off my 72 chevelle. I just want to run manual brakes and was considering a willwood master cylinder will i have to make mounts to use it or do they make somethin that bolts on? Just found the thread about the chrysler master cyl how would i hook something like that up to my pedal and will it work with front discs and rear drums?

Thanks
Matt

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Re: Master cylinder help

#2 Post by big block nova » Mon Nov 17, 2008 1:21 pm

I dont have a chevelle but i put a strange master cylinder on my 72 nova and it was not a problem. I just knocked the studs out of the factory brake pedal brkt. and if im not mistaken had to slot the holes just a little as the new master cylinder bolt pattern is a little narrower than the oem. The factory brake rod may need to be adjusted a little also. Hope this helps u some.

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chpcamaro
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Re: Master cylinder help

#3 Post by chpcamaro » Mon Nov 17, 2008 9:29 pm

one more thing you might need to drill the brake pedal hole a little higher because you are going from power to manual the angle is off by about a 1/2 inch. if you want to save some money the manual master out of a 69 camaro with disc bakes works great direct bolt on and only cost around 35.00 at autozone.
rob
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Re: Master cylinder help

#4 Post by wikd69 » Tue Nov 18, 2008 2:53 am

chpcamaro wrote:one more thing you might need to drill the brake pedal hole a little higher because you are going from power to manual the angle is off by about a 1/2 inch. if you want to save some money the manual master out of a 69 camaro with disc bakes works great direct bolt on and only cost around 35.00 at autozone.
rob
Yep, what chpcamaro said. I installed a new MC in my Camaro replacing the old one (rust/sludge/etc.), and I got a brand new OEM style MC from my local parts house for less than $40. The new one was an exact (pretty close) replacement. Prior to the replacement I had been running factory discs front and drums in the rear. I swapped my rear drums for a set of aftermarket 4 piston/caliper discs and the same MasterCylinder worked perfectly. The trick is to make certain you get MC with a 1 1/8" diameter piston. That way you're sure you move enough brake fluid for whatever you put on the car (disc/drum or disc/disc). The MC I have is one from a mid-60's Vette I believe, though it may have also come stock on the Camaro, I don't know. You'll need to make certain you have the right rod between the brake pedal arm and the MC piston too. That varies, based on application.

Hope this helps.
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Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

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Yellowchevelle
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Re: Master cylinder help

#5 Post by Yellowchevelle » Tue Nov 18, 2008 1:03 pm

Thanks for all the help guys. Where do i find the rod that goes between the MC and connecs to the brake pedal?
thanks
Matt

PS any part numbers for the camaro MC?

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Bob West
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Re: Master cylinder help

#6 Post by Bob West » Tue Nov 18, 2008 7:33 pm

I swapped mine from power disc/drum brakes to manual brakes (wilwood up front). I think I used a MC from a 77 Malibu disc/drum, my 72 Chevelle brake pedal already had two holes drilled in it, just had to move the rod in the pedal. I used the rod out of the booster though, pulled it out of the booster as far as I could and cut it off, cuz the rod that came with the manual MC was too short. The rod from the booster worked great, and had a clevis on the end for adjustability.
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chpcamaro
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Re: Master cylinder help

#7 Post by chpcamaro » Tue Nov 18, 2008 8:01 pm

what bob said works well if you are not comfortable with the cutting and just want a buy and install rod you can get them at camaro classic's, national parts depot,paddocks or just go to the junk yard and look for any gm car with manual brakes the rods are all about the same. good hunting
rob :mrgreen:
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Re: Master cylinder help

#8 Post by wikd69 » Tue Nov 18, 2008 11:16 pm

Yellowchevelle wrote:Thanks for all the help guys. Where do i find the rod that goes between the MC and connecs to the brake pedal?
thanks
Matt

PS any part numbers for the camaro MC?
I'm out of town for a few days - when I get back in I'll try to remember to get the number off the unit - it's a cast part number that I originally used to cross reference it for the parts house

If you don't hear from me in another few days, reply/quote this and it'll send me email to remind me :)
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

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chpcamaro
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Re: Master cylinder help

#9 Post by chpcamaro » Tue Nov 18, 2008 11:44 pm

if you go to auto zone and tell them you need a master cyclinder for a 69 camaro with manual disc brakes you will get just what you need we use them on almost every brake conversion from power to manual they fit and work perfect now if you have aftermarket disc with the same size calipar you don't even need a portional valve :mrgreen: i'm sure there are others but this is the easyies and a direct fit just my 2 cents
rob 8-)
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http://www.chpdragracing.com

gmracing355
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Re: Master cylinder help

#10 Post by gmracing355 » Wed Nov 19, 2008 5:21 am

I was wondering also.On my 72 nova I went from 4 wheel drum to areospace drag brakes front and stock drums rear. I got a new m/c for a 72 nova with a 1 1/8 bore but the problem is no pedal pressure. the pedal is firm but I can not hold the car on the line. Anything over 1800 rpm wants to push the car..Any ideas?? Sorry for the hijacking,lol.
Greg

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Re: Master cylinder help

#11 Post by John_Heard » Wed Nov 19, 2008 6:02 am

gmracing355 wrote:I was wondering also.On my 72 nova I went from 4 wheel drum to areospace drag brakes front and stock drums rear. I got a new m/c for a 72 nova with a 1 1/8 bore but the problem is no pedal pressure. the pedal is firm but I can not hold the car on the line. Anything over 1800 rpm wants to push the car..Any ideas?? Sorry for the hijacking,lol.
Greg
I've got a 1 1/8" Chrysler MC on mine, it can generate 1200 psi. if you push hard. It works pretty good with 4 wheel aerospace brakes. You might want to check and see that you have the pushrod pivot in the top hole on your brake pedal arm which will generate the highest force/longer throw.

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wikd69
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Re: Master cylinder help

#12 Post by wikd69 » Wed Nov 19, 2008 6:54 am

gmracing355 wrote:I was wondering also.On my 72 nova I went from 4 wheel drum to areospace drag brakes front and stock drums rear. I got a new m/c for a 72 nova with a 1 1/8 bore but the problem is no pedal pressure. the pedal is firm but I can not hold the car on the line. Anything over 1800 rpm wants to push the car..Any ideas?? Sorry for the hijacking,lol.
Greg
Transbrake :twisted:

Sorry, could'nt resist :D


Dunno, maybe a proportioning valve, let you apply more pressure up front, less in the rear ?
1969 ProStreet Camaro RS Best 9.75@139 1.46 60'
Blown 427 BBC, TH400 w/Brake, Back-Half Ladderbar
Narrowed 12-Bolt, 4.10 Gears, Spool, Moser 33 Spline

http://www.marsh-racing.com/harrys_camaro-1.htm

sc racing
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Re: Master cylinder help

#13 Post by sc racing » Wed Nov 19, 2008 7:56 am

gmracing355 wrote:I was wondering also.On my 72 nova I went from 4 wheel drum to areospace drag brakes front and stock drums rear. I got a new m/c for a 72 nova with a 1 1/8 bore but the problem is no pedal pressure. the pedal is firm but I can not hold the car on the line. Anything over 1800 rpm wants to push the car..Any ideas?? Sorry for the hijacking,lol.
Greg
There is a thread here somewhere about bore sizes,pedal ratio's etc. Most pwer brake cars have a pedal ratio less than 4:1 manual needs about 6.5:1

gmracing355
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Re: Master cylinder help

#14 Post by gmracing355 » Wed Nov 19, 2008 3:35 pm

John, The linkage is in the top hole. I do have the same crysler m/c and I gotta get the adapter fittings and install it. What did you have to do to the pushrod,any mods?
Also a transbrake does sound like fun.
Greg

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Re: Master cylinder help

#15 Post by aitch o » Wed Nov 19, 2008 3:37 pm

the master cylinder off a 85 chevy 1/2 ton 4x4 has a 1" bore, alum body and plastic resevoir. bolts on. move the pump rod from the bottom hole to the top hole on the brake pedal arm for more pressure.

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