Calling Mechanics

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Calling Mechanics

Post by rpm750 on Sat Jun 27, 2009 12:37 pm

No real problems with Brakes till now.

Setup....
Disk brakes front, Drum Rear, New dual circuit MC, Stainless Flex lines, new steel lines. Level in res looks good, used OG brake res with tee to the MC. Prestone DOT 3 Synthetic fluid. Like I said no brake problems till now.

The Problem....
Hot afternoons the brakes drag, seems like the rears. Mornings I have a spongy or no pedal at all in the afternoon or heat pedal is tight.

Theory....
I was leaning to a bad MC but if it were bad I'd have this problem all the time? Very hard pedal afternoon, soft pedal in mornings. Seem like MC is not releasing correctly. Not rod adjustment I made sure it had a small amount of play.

What I've checked...
-Res Level OK
-Rear drums hot after long ride, spit on finger to drum = sizzle.
-Fronts seem to be normal temp(they have drug a bit from start)
-Lot of play in the pedal after car sits for a while.
-No Leaks any where
-Tried bleeding brakes today and I can't or have on pressure on pedal at all. Can't build pressure to bleed.

I really think the MC is stick in, not returning all the way back out.

I'm pulling my hair out on this one.
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Re: Calling Mechanics

Post by Grifspop on Sat Jun 27, 2009 12:56 pm

Might have something to do with a residual pressure valve in the master cylinder, but I'm no mechanic, I found this thread on The Samba:

http://www.thesamba.com/vw/forum/viewtopic.php?t=363399&highlight=disc+brake+residual
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Re: Calling Mechanics

Post by 71_georgia_beetle on Sat Jun 27, 2009 1:02 pm

Who makes the MC? I went through 2 Varga MC's.
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Re: Calling Mechanics

Post by rpm750 on Sat Jun 27, 2009 2:17 pm

I think its a Varga. I just took it out and the plunger is stuck in. I pushed it in a little further trying to empty the fluid out. I'm going to take it a part, I've got nothing to loose! I hate dealing with all this corrosive fluid!
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Re: Calling Mechanics

Post by rpm750 on Sat Jun 27, 2009 4:48 pm

Got the MC apart, it is defiantly sticking. I'll take the old one off the '68 I got and see if it is any good. I may not ever waste $59 dollars on a MC again!!!!
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Re: Calling Mechanics

Post by 71_georgia_beetle on Sat Jun 27, 2009 11:29 pm

3rd time was a charm for me with a $14 MC at the local parts house.
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Re: Calling Mechanics

Post by rpm750 on Sun Jun 28, 2009 10:20 pm

I found an old Varga MC I had for this car but it sat for a while and rusted a bit. I took it apart cleaned it well and it does not stick. I went and got regular DOT 3 fluid and the parts guy said that the Synthetic was more harsh and that he had seen parts(rubber) fail due to the fluid. So I went with conventional DOT 3 fluid.

Well long story short got it(MC) back on the car and my wife pumped the pedal for me for an hour or so and he's back on the road. I drove it and I think the brakes before were dragging from the start!!! Great brakes and no dragging!

Thanks guys
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