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Andy Clark (aka 46Chevy12ton) [ View ] [ awrc55@hotmail.com ] [ Car Ads ] [ Blogs ] Winnipeg, Canada (204) 452-9444

Guys Just got the brakes working on my 46 1/2 ton, is it normal for the pedal to feel soft or hard while depressing same to the floor, Mine feels soft while depressing. I have disc in front and drums in rear, New master cylinder under floor with proportioning valve & 10lb residual value in rear lines

Comments

Posted by JAWS  -  02/13/2008 12:04 PM sounds like you still have air. Brakes are a hydraulic system in which fluid is used to take the space between the cylinder applying pressure and the piston receiving. Air in the system will cause the fluid to be less dense. Therefore more movement of the master cylinder is required to make up the pressure and volume needed to be applied to the piston in the caliper in order for it to move enough and maintain the pressure being applied. I apologize for the wordy-ness. An electrical headache can make a great car a pain [ View ] [ Email ] [ Blogs ] [ Car Ads ] Boise, Idaho Charter Member since August 2004   Posted by DavyJ  -  02/13/2008 07:11 PM Andy. Try the bleeding of the brakes first. but if it persists check the master cyl, some have a built in residual valve for the drum brakes. Did you happen to check if there was one before you added the after market one? it is a small neoprene diaphragm that is behind the fitting in the master cyl. The other thing that will affect pedal pressure is the pedal ratio. that is the distance between the actuating rod and the pivot point on the pedal vs the distance up to the pedal pad. if that ratio is a lot greater than the factory ratio, it will make the pedal pressure feel lighter. Oh yeah.....the truck is looking good! Still driving the wife's car, cause I am slow. [ View ] [ Email ] [ Blogs ] [ Car Ads ] Niagara Falls, Canada Charter Member since February 2005   Posted by Red's Place Custom & Restoration  -  02/13/2008 07:34 PM if your master is lower than your calipers and wheel cyclinders you will sometimes need a residual valve in line for both front and rear you may also have to bleed the brakes with one of the vaccum pump type bleeders. After that you should have good pedal it should never feel soft or spongy. You can go to master power brakes web site and read up on pedal ratio I forget what it should be but power brakes have a different ratio than manul. Hope this helps RED Red's Place Custom & Restoration [ View ] [ Email ] [ Blogs ] [ Car Ads ] Charlotte, North Carolina   Posted by ronhotrod  -  02/13/2008 07:40 PM Along with the 10lb rear residual check valve you need a 2lb valve in the FRONT to keep the caliper from returning to a full rest position. Check your M/C by inserting a small rod (like a gas welding rod) into the fitting on the M/C. where the lines attach If it goes into the unit there is no check valve. If you can't get the rod in there IS a check valve. Best method to bleed the brakes is a vaccuum one man unit. Instead of pumping the air through the lines, you pull it to the wheel via the vaccuum. its saver and easier. A vac bleeder can be purchased at most larger parts stores for around $35. money well spent. ronhotrod [ View ] [ Email ] [ Blogs ] [ Car Ads ] Mount washington, Kentucky Charter Member since July 2001   Posted by 46Chevy12ton  -  02/13/2008 08:10 PM Thanks Guys, If the weather is warmer at home when we return from Kelowna, BC I will look at the master cylinder and bleeding the lines. 46Chevy12ton [ View ] [ Email ] [ Blogs ] [ Car Ads ] Winnipeg, Canada   Posted by 46Chevy12ton  -  04/20/2008 08:42 PM Thanks for the help Guys Now that the weather is warmer, I have added a two lb residual valve to the front disk brake and re bleed the brakes. Pedal is a lot harder now 46Chevy12ton [ View ] [ Email ] [ Blogs ] [ Car Ads ] Winnipeg, Canada

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