Brakes locking down
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- Sweptline.ORG Member
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Brakes locking down
Been working on my 62 D100 and finished my Scotts IFS swap in front and have taken it for a couple drive and have noticed the front brakes which are now disc seem to not want to release fully and my brake pedal is very stiff with little travel. Have new rear drum brakes that are adjusted properly. Have the factory single reservoir master cylinder, non power. Do I need to replace the distribution block on the frame with a adjustable proportioning valve? Anybody run into this before?
Brandon in Oklahoma
Brandon in Oklahoma
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Re: Brakes locking down
Do u have any old, original, rubber flex lines in the front?
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- Sweptline.ORG Member
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Re: Brakes locking down
No their new braided steel lines to the calipers in front and the rubber line at rear brakes is a new one. Thanks.
Brandon
Brandon
Re: Brakes locking down
If going to disc brakes I thought I read here that one needs to use a disc brake master and also use an proportioning valve?
This was for a disc dana 44 swap but seems like it would be the same?
jim
This was for a disc dana 44 swap but seems like it would be the same?
jim
- Txas2step
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Re: Brakes locking down
You need a dual disc/drum master and I used a disc/drum dist. block I purchased on Ebay.
61 shorty 170/ 3spd 3:91(sold)
66 lwb 318 poly/727/4:10 (sold)
67 shorty 318poly/4spd 3:55
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66 lwb 318 poly/727/4:10 (sold)
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68 ute 318/3 spd/3:55(sold)
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- soopernaut
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Re: Brakes locking down
I don't think front disc/rear drum is going to work with a single reservoir master cylinder.
- dodgeboykim
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Re: Brakes locking down
soopernaut wrote:I don't think front disc/rear drum is going to work with a single reservoir master cylinder.
And you have no safety back up with a single master cylinder if something goes wrong.
My truck is younger than me.
66 W100. 70 D 500 , 69 Hiab Speed Loader. 96 Ram 3500 Club Cab Cummin's 5 spd. 97 Ram 1500 Club Cab 5.9 gas auto. 83 W200 LB Propane 360 auto 09 Yammy Rhino 700.
66 W100. 70 D 500 , 69 Hiab Speed Loader. 96 Ram 3500 Club Cab Cummin's 5 spd. 97 Ram 1500 Club Cab 5.9 gas auto. 83 W200 LB Propane 360 auto 09 Yammy Rhino 700.
Re: Brakes locking down
I don't remember for sure, but doesn't the stock master cylinder have a built in residual valve? That could cause some interesting issues with front discs.
'63 D100
Build Link: viewtopic.php?f=34&t=40000
Build Link: viewtopic.php?f=34&t=40000
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Re: Brakes locking down
Ya I know that it would be better with a dual master cylinder reservoir, but I'm not the best about flaring brake lines, ha. Was wanting to just stick with the single reservoir if I could. Thanks.
Brandon
Brandon
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Re: Brakes locking down
There is an RPV in the stock master. That is your problem.
Why would you go to all this trouble to swap in disks and not do the job right and safe? (dual master)
Mess with the brakes, hurt someone in an accident, their atty will rip u apart and your insurance company will probably not cover it claiming u defectively modified it.
Why would you go to all this trouble to swap in disks and not do the job right and safe? (dual master)
Mess with the brakes, hurt someone in an accident, their atty will rip u apart and your insurance company will probably not cover it claiming u defectively modified it.
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Re: Brakes locking down
Ha didn't know I was going to get griped out, was just wanting some advice. Thanks for all the help, I went with the single reservoir cause it was new and didn't think of it causing an issue and the way Im going to drive the truck in rural western Oklahoma with not much traffic and a all new brake system didn't think I would have a issue of a leak that I would loose the fluid. Thanks, I'll get it changed.
Brandon
Brandon
- Jims68
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Re: Brakes locking down
Just curious... what is an RPV?PwrWgnDrvr wrote:There is an RPV in the stock master.
Re: Brakes locking down
Jims68 wrote:Just curious... what is an RPV?PwrWgnDrvr wrote:There is an RPV in the stock master.
Residual Pressure Valve. The aftermarket ones keep approx 2-10 psi remaining in the brake line to prevent the wheel cylinders from completely retracting, kind of like an infinitely adjustable brake adjuster... Not sure what value the stock one leaves in the system, but probably pretty close.
The only time I've ever seen them used with disc brakes, the 2 psi fixed valves were used when the master cylinder was mounted below the floor to prevent a backflow situation.
'63 D100
Build Link: viewtopic.php?f=34&t=40000
Build Link: viewtopic.php?f=34&t=40000
- Jims68
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Re: Brakes locking down
Thanks! See? Ya learn something everyday!BigJimG wrote:Jims68 wrote:Just curious... what is an RPV?PwrWgnDrvr wrote:There is an RPV in the stock master.
Residual Pressure Valve. The aftermarket ones keep approx 2-10 psi remaining in the brake line to prevent the wheel cylinders from completely retracting, kind of like an infinitely adjustable brake adjuster... Not sure what value the stock one leaves in the system, but probably pretty close.
The only time I've ever seen them used with disc brakes, the 2 psi fixed valves were used when the master cylinder was mounted below the floor to prevent a backflow situation.
- soopernaut
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Re: Brakes locking down
Great Info soopernaut, thanks a lot!!!!!!!!!
Brandon
Brandon
Re: Brakes locking down
only way to keep the single reservoir is to take apart the master cylinder, remove the residual pressure valve, buy a remote mounted 10 psi residual valve and install it on the line that goes to the rear brakes. you dont need a residual valve for disk brakes unless you are running an older car with nan under the floor mater cylinder.