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Post by bigtendude on Sept 23, 2007 21:21:35 GMT -5
2 Times this week, as I made hard left turn with my foot on the brake, the pedal went to the floor and I could pump it once and it would come back up. It (the brakes ) operate fine till I make similar moves again. the fluid level in the master cylinder is up to normal level. I see a bit of fluid at rear of cylinder on the booster. I cleaned the fluid off, and see no more seepage as yet. Is it possible that this could only happen on hard left turns only, has anyone ever experienced this or even heard of it happening before? I think maybe it is time for a new master cylinder. But, I was curious. I have 1978 C10 Big 10, 350cui. , TH350, 11" X 2" rear drums, Discs in the front. My brakes lines attach on the right side as you look from front of the engine compartment at the master cylinder. When I apply the brakes under normal driving conditions, if I mash a little hard, I can hear a SQUISH noise under the dash. could this be from a bad diaphram in the cylider? I had the front wheels off today to check condition of rotors and pads, everything looks new, no warpage of rotors. The rears are a different story, I need new drums, shoes and brake hardware, it all looks original back there, drums are definately out of round, they have rivet grooves very deeply imbedded in them. Only the shoes have evr been replaced ( I think ) lol. The shoes on left rear are loose on the mounting pins ( Nail through back of backing plate ) Will replace all mounting hardware. The current shoes are bonded and there are chunks of braking material missing on left side front part of shoe, shoes are worn really thin ( 3/16th.'s ) in the middle of shoe, and 1/4" on each end. Thanks for replies in advance. I didn't even know where to post this question. Sorry if it's in wrong place.........Larry BTW, my truck is 2 wheel drive, 1 wheel squeal.
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83
Truck Lover
Posts: 41
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Post by 83 on Sept 24, 2007 0:24:28 GMT -5
ok is it a vacuum assisted or hydroboost {power steering assisted] sounds like the power booster check the hose from the brake booster to the intake if its vacuum powered.if it's hydro boosted check the fluid in the power steering pump.also sometimes when you turn the power steering puts a load on the engine causing it to idle lower than normal.meaning less vacuum and soft brakes.hope this helps
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Post by bigtendude on Sept 24, 2007 5:49:07 GMT -5
Sorry bout the misunderstanding of my definition of a hard left turn. Not locking steering wheel HARD to the left, just making a sweeping left turn from major road onto my sidestreet, trying to beat oncoming traffic, that causes me to lay on the brakes during turn, so I don't hit parked cars. You know, what I mean ? fluid level is ok in power steering pump, will have to see if I have vacuum assist.
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Post by BowtieGuy on Sept 24, 2007 19:46:39 GMT -5
More than likely you have vacuum assisted power brakes. The best way to check the booster and master cylinder is like this. With the truck running and just sitting in the drive way, push the brake pedal and hold it, if you feel the pedal slowly getting closer to the floor with the same constant foot pressure then the master cylinder is bad. To test the booster, you pump the brakes at a fast pace (push them and let off then push them.........) and you can hear the engine rpm speed up then the booster is bad. If neither happen then they are fine. If you have hydraulic assist brakes (hoses that run to your steering gear box also run behind the master cylinder) I am not sure how to check that. But this will be a good starting point. Preform these tests and lets us know the results and we will work from there.
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Post by bigtendude on Sept 25, 2007 20:07:10 GMT -5
Ok, I was just going to pose another question, but you saved me from that.......lol. I was sitting at a traffic light today and as I had constant pressure on brake pedal, it would slowly leak down, but would not go all the way to the floor, and when I released foot from pedal and stepped on it again, it would be right at the top and not leak down again. Yesterday I put new rear drums and shoes ( riveted ) and new springs, and other assorted hardware on the rear. The br brakes are stopping much better now and I feel alot safer. There was no fluid leakage anywhere on whole truck, not under hood or anywhere else. And yes I do have vacuum assisted booster. A question about that though. What is the little cannister thingy, that looks like a metal inline fuel filter, that is between big vacuum line from booster and line hookup to engine?
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83
Truck Lover
Posts: 41
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Post by 83 on Sept 26, 2007 0:02:01 GMT -5
it's a check valve
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Post by Pontiac1976 on Sept 26, 2007 7:18:08 GMT -5
The check valve ( one way vacuum L shape plug in the vacuum booster ) if you have a filter, just after the steel line going to the booster in line it usually black most time. Not on the early years .
But very good to have, helps keep the oil & oil fumes out of the booster to help it last longer. .Some one might have put one (in line )
on your's.. Always a great idea to have one there. Do not forget to replace them on every third to fourth oil change depending on run time & miles
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Post by Pontiac1976 on Jun 28, 2015 11:30:01 GMT -5
 These are what it look's like |
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