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brakes locking up #1468852 07/16/13 04:10 PM 07/16/13 04:10 PM
Joined: Oct 2006 Posts: 55 MILFORD, MICHIGAN M MILFORD MOPARS OP member
MILFORD MOPARS OP member M Joined: Oct 2006 Posts: 55 MILFORD, MICHIGAN	hey guys just restored a 71 duster has drum brakes all around.power booster or brake fluid is exspanding.it has tti headers .anyone ever had a problem with the distribution block getting to hot?all 4 brakes are engaging after the car drives for a wile.but releases after its cooled dowm.thought about making a sheild.???? thanks

Re: brakes locking up [Re: MILFORD MOPARS] #1468853 07/16/13 05:32 PM 07/16/13 05:32 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	I'm pretty sure it is not the fluid getting hot and expanding. Try loosening the 4 nuts that hold the master cylinder to the booster and see if that will allow the brakes to release. Be sure the drums brakes are adjusted properly and that you have the shoes installed properly. Last edited by Challenger 1; 07/16/13 05:32 PM.

Re: brakes locking up [Re: MILFORD MOPARS] #1468854 07/16/13 09:58 PM 07/16/13 09:58 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	seperate the M/C and the booster & measure how much clearance you have between the round nub on the end of the pushrod & the bottom of the piston recess (want ~.060"). For a quick check shorten it & see if that fixes the problem. If you get too much clearance you wont have enough pedal reserve (pedal too close to floorboard when brakes are applied) live every 24 hour block of time like it's your last day on earth

Re: brakes locking up [Re: MILFORD MOPARS] #1468855 07/23/13 08:41 PM 07/23/13 08:41 PM
Joined: Oct 2006 Posts: 55 MILFORD, MICHIGAN M MILFORD MOPARS OP member
MILFORD MOPARS OP member M Joined: Oct 2006 Posts: 55 MILFORD, MICHIGAN	yep tried that .tti tells me my m.c. is not venting??? I did shorten the rod and it did not help.maybe the booster is not releasing after it gets hot?? could the pads be installed backwards and create heat?

Re: brakes locking up [Re: MILFORD MOPARS] #1468856 07/23/13 09:29 PM 07/23/13 09:29 PM
Joined: Feb 2003 Posts: 8,675 A Andrewh master
Andrewh master A Joined: Feb 2003 Posts: 8,675	or the booster is bad. seen a lot of posts on that lately. there is an internal check valve that if it goes back can draw the pedal down. This will cause your brakes to engage while driving. See if you have the same problem with the booster capped so you don't draw vacuum.

Re: brakes locking up [Re: MILFORD MOPARS] #1468857 07/24/13 03:01 PM 07/24/13 03:01 PM
Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio Challenger 1 Too Many Posts
Challenger 1 Too Many Posts Joined: Feb 2005 Posts: 28,312 Cincinnati, Ohio	Quote: yep tried that .tti tells me my m.c. is not venting??? I did shorten the rod and it did not help.maybe the booster is not releasing after it gets hot?? could the pads be installed backwards and create heat? Yes

Re: brakes locking up [Re: Challenger 1] #1468858 07/24/13 03:37 PM 07/24/13 03:37 PM
Joined: Nov 2004 Posts: 9,312 SoCal 68HemiB master
68HemiB master Joined: Nov 2004 Posts: 9,312 SoCal	FYI: In drum brakes, the shoe with the longer and/or darker friction material goes toward the rear. The shoe with the shorter and/or lighter friction material goes toward the front. Down to just a blue car now.

Re: brakes locking up [Re: 68HemiB] #1468859 07/24/13 03:44 PM 07/24/13 03:44 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	I still think the prob is in either the booster or the M/C especially if all 4 corners are locking live every 24 hour block of time like it's your last day on earth

Re: brakes locking up [Re: RapidRobert] #1468860 07/24/13 03:50 PM 07/24/13 03:50 PM
Joined: Nov 2004 Posts: 9,312 SoCal 68HemiB master
68HemiB master Joined: Nov 2004 Posts: 9,312 SoCal	Quote: I still think the prob is in either the booster or the M/C especially if all 4 corners are locking Absolutely. My FYI was simply a reply to the "shoes installed wrong" comment. I personally do not think that is the O.P.'s problem. When locked up: 1. Separate the mc from the booster slightly to see if they unlock. If that unlocks them, look to the rod length or booster or check valve. 2. If it doesn't unlock them, crack the hydraulic lines at the master and see if there's trapped pressure (in which case it's a mc issue). Down to just a blue car now.

Re: brakes locking up [Re: 68HemiB] #1468861 07/24/13 04:22 PM 07/24/13 04:22 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	Quote: Quote: I still think the prob is in either the booster or the M/C especially if all 4 corners are locking Absolutely. My FYI was simply a reply to the "shoes installed wrong" comment. I personally do not think that is the O.P.'s problem. Yeah I was directing my post strickly to the OP live every 24 hour block of time like it's your last day on earth

Re: brakes locking up [Re: RapidRobert] #1468862 07/24/13 04:55 PM 07/24/13 04:55 PM
Joined: Dec 2010 Posts: 409 PEI Canada chromedome426 mopar
chromedome426 mopar Joined: Dec 2010 Posts: 409 PEI Canada	My guess is a faulty booster allowing engine vacuum to apply the brakes. Next time it happens, pull the vacuum hose check valve out of the booster to see if it will release the brakes.

Re: brakes locking up [Re: chromedome426] #1468863 07/24/13 10:35 PM 07/24/13 10:35 PM
Joined: Oct 2006 Posts: 55 MILFORD, MICHIGAN M MILFORD MOPARS OP member
MILFORD MOPARS OP member M Joined: Oct 2006 Posts: 55 MILFORD, MICHIGAN	yep I did pull that vacuum line off wile the car was warming up.but it didn't free up.when I backed the m.c off a little it freed up ive backed they adjustment in and lost peddle but still builds up pressure.took the booster off last night.found a little corrosion.im going to clean it up and see if that works. thanks guys

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