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Old 08-19-2003, 06:05 PM
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Brake Questions

Hi,

I have a 61 Willy's CJ5 Jeep. I'm not sure if you'd put this in a hot rod class or not but I need some brake advice. I've been doing a disc brake conversion using backing plate and caliper parts from a 1977 Blazer. To give you an idea of what I've done you can visit this page: http://www.oldjeep.com/disc.htm

The other thing that has been done is the brake pedal assembly has been converted to a swing pedal. I'm using a MC from a 71 Corvette which is a manual MC designed for disc brakes. I have replaced every braking item in the front from lines to calipers. The problem I'm having is that the brakes don't seem to be getting hard. I've bled and bled and they won't get hard. A previous MC I used was hard after bleeding but it wasn't big enough for the calipers so it wasn't strong enough to stop the jeep. Since using the new MC I haven't been able to get a stiff pedal.

Does anyone have any suggestions on what could be wrong? I'm wondering if the Corvette MC travels farther than the previous MC. I think maybe the brake pedal isn't getting fully depressed because of the floor board and it might be preventing me from getting full brakeage. Oh yah, the thing about my old MC is I have no idea what it's from, the MC and swing pedal had been converted by a previous owner.

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Old 08-20-2003, 06:45 PM
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i can't really answer your question, but if you know what calipers you have, what mc the vette is using, and measured the 'original' mc bore, you could give this info to somebody on a brake tech line like at Baer or somewhere, and maybe they could help you figure it out.

other than that, i'm not sure. do you have a proportioning valve installed? this could probably help part of your problem.

good luck,

JB

another thing i just thought of, you said you used blazer calipers, i wonder if they are the same as the chev 1/2ton calipers that are spec'd in the instructions from your link. i work at an autoparts store, if i remember tomorrow i will check to see the bore sizes, etc. of the calipers. if the blazer calipers are bigger then maybe that's why your master cylinder doesn't have enough force to operate them properly.
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Old 08-21-2003, 06:05 PM
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Bugatow,

well i don't know how much help this will be but i checked out the listings for blazers and pickups for you.

the vette never used the same mc as trucks.

the 2WD Blazers used the same front calipers as the C10/C15 pickups up to 1978 and some were the same after 1978. The 4WD blazers used different front calipers.

the Blazers and pickups used the same master cylinder from about 1974 to 1980 with some exceptions.

all of the GM mc's were 1-1/8" bore, including the vette, up until about 1981 when they went to 30mm bores which is slightly smaller than 1-1/8".

from the instructions for your webpage link they say to use pre-87 p/u parts, but pre-87 could be anything.

good luck,

JB
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Old 08-22-2003, 09:37 AM
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Johnny's got you looking in the right direction. You also may want to look at where the pedal pivots. On some pedals, there's different pivoting locations to make the stroke longer/shorter.
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