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Frame/Suspension/Brake... Talk & Q&A All things... Frame/Suspension/Brake

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  #11  
Old 02-14-2017, 04:18 AM
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the master cylinder in the dodge truck was brand new, it went bad with no warning, smucked a rig, internal failure was the cause, put in a new oe, cheap insurance.

Later
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  #12  
Old 02-15-2017, 07:20 AM
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I had a perfect pedal but holding it for about a minute it would go to the floor. It got so that after it went all the way down the brakes wouldnt let go and the car move until the pressure would bleed off from the master cylinder.
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  #13  
Old 03-30-2017, 06:37 PM
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Okay guys, thanks for all the comments, ordered a new master cylinder and got it installed . Everything worked prefect for approximatley 60 miles, then today I pulled up in front of the shop and the pedal went to the floor again, the brake warning light came on. I pumped the pedal once then a second time and the pedal came back and the light went out. The only parts left in the system that are not new are the hoses and the proportioning valve. The hoses all looked good and were not hard or cracked, could the problem be in the prop valve?
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Old 03-30-2017, 08:28 PM
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Could it be leaking by internaly in the proportioning valve? it might be worth changing.
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  #15  
Old 03-31-2017, 01:46 AM
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not sure how the propvalve would cause something like that...
I`m thinking bad mc. I`ve had my share of bad "new" stuff...

maybe a soft hose expanding under pressure?
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  #16  
Old 03-31-2017, 03:58 AM
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Quote:
Originally Posted by kenny c View Post
Could it be leaking by internaly in the proportioning valve? it might be worth changing.
Quote:
Originally Posted by dutch View Post
not sure how the propvalve would cause something like that...
I`m thinking bad mc. I`ve had my share of bad "new" stuff...

maybe a soft hose expanding under pressure?
Thanks guys, If I understand the prop valve it just has a plunger that slides one way or the other if there is a failure front or rear as well as the proportioning function.

I think I should order new hoses
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  #17  
Old 03-31-2017, 07:26 AM
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Man, I'm trying to remember what post it was, Didn't somebody else here in the not too long ago past do a post on a similar problem where the op found a problem with the length of the actuater rod on the mc was adjusted either too long or short and the mc couldn't work right until the rod throw was adjusted right???
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  #18  
Old 03-31-2017, 10:09 AM
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Quote:
Originally Posted by smallfoot View Post
Man, I'm trying to remember what post it was, Didn't somebody else here in the not too long ago past do a post on a similar problem where the op found a problem with the length of the actuater rod on the mc was adjusted either too long or short and the mc couldn't work right until the rod throw was adjusted right???
yea, but why work fine for 60mls...?
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  #19  
Old 03-31-2017, 10:47 AM
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Quote:
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yea, but why work fine for 60mls...?
And the first worked fine for 2100 miles
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  #20  
Old 03-31-2017, 04:28 PM
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Yeah, I know...trying to make some sense of it. There was a post about that rod not being adjusted right and the plunger not making it by the vent every time or something...just trying to figure out the "why not all the time" deal.
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