Nonlinear Brakes
#1476118
07/29/13 07:28 PM
07/29/13 07:28 PM
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Joined: Mar 2011
Posts: 183 Charleston, SC
bronco9588
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OP
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Posts: 183
Charleston, SC
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So I have changed out rear drum brake pistons, rebuilt front calipers, new flexible hoses, new stainless steel lines I ran her for a little while on that setup, and then purchased a new master cylinder and brake booster. Now I have 0 braking effort for 90% of the travel and then the brake kicks in a the last second and locks up. I have bled my brakes twice with no noticeable effort. I think I have one of two problems: 1) Push rod adustment: I don't feel like the brake pedal is loose and that the pushrod is making contact further down the travel. It wouldn't explain the brakes locking up. Are these guys compatable with brake boosters? http://chucker54.stores.yahoo.net/brakcylpuspa.html 2) Do I need to bench bleed the master cylinder?
'73 Charger Petty Blue, Black Vinyl, and Gill Slits
727 torque-flight
400 BB Chrysler
8 3/4 rear
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Re: Nonlinear Brakes
[Re: bronco9588]
#1476119
07/29/13 08:09 PM
07/29/13 08:09 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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Did you properly adjust the rear shoes?
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: Nonlinear Brakes
[Re: Supercuda]
#1476120
07/29/13 08:18 PM
07/29/13 08:18 PM
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Joined: Mar 2011
Posts: 183 Charleston, SC
bronco9588
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OP
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Joined: Mar 2011
Posts: 183
Charleston, SC
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No, but they were working before I swapped out the master and the booster. I then drove 1,000 miles. If they were off, would they not have adjusted by then? This problem showed up after the master cylinder and booster swap.
'73 Charger Petty Blue, Black Vinyl, and Gill Slits
727 torque-flight
400 BB Chrysler
8 3/4 rear
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Re: Nonlinear Brakes
[Re: EV2DEMON]
#1476122
07/29/13 08:38 PM
07/29/13 08:38 PM
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Joined: Mar 2011
Posts: 183 Charleston, SC
bronco9588
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OP
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Joined: Mar 2011
Posts: 183
Charleston, SC
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That is correct. I have a pair of old brake lines that I can use to do the job. I think after my reading that this is probably the problem.
Why would the brakes lock up so quickly?
'73 Charger Petty Blue, Black Vinyl, and Gill Slits
727 torque-flight
400 BB Chrysler
8 3/4 rear
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Re: Nonlinear Brakes
[Re: bronco9588]
#1476125
07/31/13 05:27 PM
07/31/13 05:27 PM
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Joined: Jan 2003
Posts: 1,037 Texas, Dallas
G_T
super stock
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super stock
Joined: Jan 2003
Posts: 1,037
Texas, Dallas
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did you switch from manual to power brakes?
Probably not it... but some of these cars had different brake pedal lengths/pivot points/ratios for the booster rod and that can happen.
We switched from manual to power on my bothers 70 Fury and it did the same thing... nothing for 90% of travel then lock up... Changed out the pedal and all fixed. didnt make sense... but... hey
1970 Charger - V10, 6spd, Alterkation, Street Lynx 4 Link, Moser Dana 60, Wilwood 14" disks, Forgeline 18" Wheels (Rear:335's), ISIS Multiplexing Wiring http://www.v10mopar.com
2012 Charger SRT8
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