brake upgrade questions ,Chrysler master cylinder..
 

I am posting a pic ,it appears my truck has a Chrysler master cylinder , no proportioning valve and of course it is still drum brakes all 4 corners.. My question is this , I know Chrysler master cylinder like this were used on drum brakes , but were they used without proportioning valves??
My son had a brake line start leaking , and of course he never noticed , so I go to move the truck and the pedal goes to the floor , it still had brakes ,but the front of the master cylinder was empty .rear line was leaking .... I am no Chrysler expert so I am hoping someone here is...

Re: brake upgrade questions ,Chrysler master cylinder..
 

Never seen one with a Chrysler Master on it. But having done a conversion on my 64 & 65 from manual single pot master to manual dual pot (drum/drum) No proportioning valve is needed with the 67 and up C10 dual masters. Same is true for the C10 Drum/Drum power master....the proportioning is in master cylinder.

As I recall, you should not need a proportioning valve until you have a disc/drum set up.

There are some smarter folks on here, they'll pop in directly.

Re: brake upgrade questions ,Chrysler master cylinder..
 

That is what I was thinking , but wanted to be sure....Thanks

Re: brake upgrade questions ,Chrysler master cylinder..
 

Well, all that said, if the back plum locks up and drags before the front and yer ass swings around in the other lane, then ya prolly need a proportioning valve for the rear line. :)

Re: brake upgrade questions ,Chrysler master cylinder..
 

No proportioning valve is needed for a drum/drum braking system. Just for the disc/drum and disc/disc systems.

Re: brake upgrade questions ,Chrysler master cylinder..
 

See, I tol ya somebody smarter than me was gonna pop in here. Thanks Capt!

Re: brake upgrade questions ,Chrysler master cylinder..
 

It always worked normal so I thought it was OK , that being said I do need to replace the line from the master cylinder because it has 2 compression fittings in it and I also need a new rear brake hose because it is the wrong one and it has no mount . and the crimps have rusted away ,they look too thin for my liking..so it is kind of floating around ... Hopefully my son learned about adjusting brakes and maintainance .. I hope...