master cyl.& rear shoes

towpainter3

towpainter3

Member
Hey guys, 74 s2 44's front and rear 304 auto 4x4 33x1250 tsl.
Ok I just replaced the front brake lines with extended sst lines. Also replaced both calipers , master cylinder, { has vac booster},pads and rear shoes with complete hrdwr kits. The m/c is the type with both reservoirs that are the same size. I have adjusted the rear shoes with a drum guage and bled this system till I own stock in the brake fluid plant.
Now the issue. The pedal seems to have some extra travel , please guide me thru the proper adjustment procedure for the m/c push rod. If applicable.
Also when bleeding the brakes on all 4 wheels the amount of fluid coming from the bleeders was not consistent. I would get a good strong stream then a weak one. Cheesy m/c? And yes it came from the oil and air freshner emporium lol. Or maybe the
proportioning valve it seems fine but its 35 yrs old.im concerned because I cant get it to lock up in a panic stop. Maybe its just me hell I dont know. I know this should be simple but im pullin my hair out here. Any advice would be greatly appreciated.
 
For you disc/drum brakes, the metering/proportioning valve has a button on the front you press to bleed the front discs. This keeps the metering valve from restricting flow to the calipers when you try to bleed them. Your pedal travel could Be not all the air is out, but you didn't mention any pull to either side when braking.
 
If you have disc brakes the master cylinder should have one reservoir larger than the other. If the reservoirs are the same size you May have one for a drum brake setup.
 
The truck doesnt pull at all, and the original m/c had the larger front reservoir. The replacement does not but the numbers are the same according to the book and the counter monkey m1494 thats the fenco number I have an original off of a 79 should I just break down and get a rebuild kit for it at napa or another part house? I will try to bleed them again also the rear shoes seem to wear out really quick 3 sets in 18 months . And they are installed correctly the fronts seem to wear just as quick . I know they are organic but dang they should last longer especially when this is not a daily driver.
 
If it's eating shoes like that, then there is heavy drag on the brakes going on.

Most likely the bogus master cylinder has some incorrect residual pressure valves installed. In today's parts world , it's more likely there are no valves at all on a replacement mc.

A disc brake "system" uses a 2psi residual pressure valve setup, a drum system uses a 10psi nominal rpv.

Regarding the master cylinder, inna stocker, the rpv unit is a small rubber "plug" looking device inside the outlet ports on the master, works kinda like a bottle nipple, one-way checkvalve. Replacement mcs I buy nowadays (new or remans) never have a rpv.

In some cases, someone May have added an "inline" rpv which is normally an aluminum or brass fitting that looks kinda like a hydraulic tube coupling fitting (union).
 
Ok searched the lines and found a union only on the line going tothe rear so thats good as for the dragging part ive doulde checked everything even the foot brake cables and its correct . Gonna rebleed and if that dont fix it im goona get a m/c rebuild kit and start over I'll keep yall posted and thanks for the advice
 
Ok,found the problem aftermarket reman m/c. After rebuilding a stock mastercylinder off my part truck with the kit I had to order. The Scout stops good now good firm pedal . The kit came with new residual valve for the rear but none for the front but it did come with a new insert for it after removing the old ones with a screw I found the front reservoir did not have a valve . This m/c came from a 79 and it is the factory installed cylinder it still has the IH part number and symbol on it. So far all is well. Thanks for the help if you need numbers for the kit let me know
 
Shit tow...you have great luck with all the bullshit we sling around here! Yore our poster child (for what I don't know??).

Fooked over "reman" master cylinders are rampant in the aftermarket parts bizz!!! I always plan to go through at least two of 'em to end up with one that functions properly!
 
Damn michael , dont want to be the poster child for anything . I guess my luck with the bullshit is from being taught to deal with stuff the old fashioned way. Fix it before you buy. My dear grandad taught me that. If the factory put it there it was for a reason. Hell ive learned alot thru the years thanks to guys like you that were willing to share their knowledge with others . And I ave tried to do the same with my boys. My oldest is finishing a samurai buggy on 42s built by himself welding and machine work . And my youngest still learnin lol blew his up no oil in the motor. Well at least he learned that one . Again thanks for the help.
 
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