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brake problem!
#199438
01/20/09 08:21 PM
01/20/09 08:21 PM
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Anonymous
OP
Unregistered
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Anonymous
OP
Unregistered
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I did a disc from drum conversion on my 69 rr,the basic swap 76 a body spindles ,new rotors,calipers,master. The brakes never seemed right,I've tried different bore masters without any changes So the other day I put a pressure gage on it and only got 500lbs of pressure. These are power brakes I used the booster that I had with the drums,the only thing I didn't change was the distubution block. I have a electric vac pump'so plenty of vac,pedel isn't hard,car just doesn't want to stop and no pressure to front. Any thoughts??? THANKS EDDIE B
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Re: brake problem!
#199439
01/20/09 08:35 PM
01/20/09 08:35 PM
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Joined: Dec 2007
Posts: 304 Ohio
LS-300
enthusiast
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enthusiast
Joined: Dec 2007
Posts: 304
Ohio
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Get the proportioning valve. distribution block, for a disc brake car. They are very different as pressures front to rear are critical in stopping.
1979 Chrysler 300
1968 Barracuda project
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Re: brake problem!
#199440
01/20/09 09:21 PM
01/20/09 09:21 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Been a lot of parts consolidation in the caiper arena over the last few years. When I converted my 65 Cuda over I had soft brakes, mine are manual. Turns out the calipers were not on the right sides and was trapping air in the top of the bores. Might be your problem.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: brake problem!
[Re: Supercuda]
#199441
01/20/09 09:30 PM
01/20/09 09:30 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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is it possible that you need to change the length(clearance) of the adjustable pushrod between the booster & the MC OR use a disc booster. FYI '76 A body calipers use a 2.75" bore as opposed to a 2.60" bore dia in the 73-75 calipers though as said w only 500 psi the calipers aren't the problem right now.
live every 24 hour block of time like it's your last day on earth
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Re: brake problem!
[Re: dlocreeb]
#199443
01/20/09 09:57 PM
01/20/09 09:57 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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with several MC's it isn't that & a fresh conversion means the calipers most likely are good & the drum splitter means each corner has 500 psi that only leaves; Is the "linkage" not pushing in the MC piston in far enough(too much free play) or the drum booster is not pushing the "linkage" far enough into the MC even with the free play being correct.
live every 24 hour block of time like it's your last day on earth
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Re: brake problem!
[Re: dlocreeb]
#199444
01/20/09 09:58 PM
01/20/09 09:58 PM
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Anonymous
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Anonymous
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The master is a disc/drum one. The brake lines are stainless line all new. The only thing I can think it would be is booster or disturubtion block. Also calipers are on rights sides ,bleeder to the top. THANKS keep the thoughts coming. EDDIE B
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Re: brake problem!
#199445
01/20/09 10:05 PM
01/20/09 10:05 PM
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Joined: Jan 2003
Posts: 1,482 Lake Orion, MI
goldduster318
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,482
Lake Orion, MI
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I'd bet on the booster not providing enough master cylinder travel. Only air in the system, internal master cylinder leakage, or not enough pedal travel would cause low pressure.
My car has a drum distribution block (70 Duster) with the 74 Duster spindles and 80 volare calipers and my brakes work great.
'70 Duster 470hp 340/T56 Magnum/8 3/4 3.23 Sure-Grip
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Re: brake problem!
[Re: dlocreeb]
#199447
01/20/09 10:42 PM
01/20/09 10:42 PM
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Joined: Nov 2003
Posts: 36,040 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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split the MC/booster & decrease the clearance via the threaded rod & see if that helps the situation. Dont go too far because if the piston assy in the MC is too far forward it'll cover the small vertical fill hole from the reservoir down to the bore but you might adj it & if it helps...
live every 24 hour block of time like it's your last day on earth
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