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#1
11-22-2008, 12:18 PM
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Off Brand but---
I ask your forgiveness for an off brand question. My 83 VW diesel Pickup. I just replaced the brake pads. Now I have only one side that brakes effectively. By one side I mean that the left front and right rear will readily lock up on my stone driveway. Not so the other side. Jacking up the offending side proves that the brakes to those wheels will prevent hand turning of the wheels. The pedal seems to be a bit soft and sometimes will go slowly down more than it should. I have bled that side and no air comes out.
Question: Is there a proportioning valve on this unit?? Could this cause these symptoms?? If so can it be adjusted. Is the Master cylinder at fault?? I hesitate to consider the vacuum booster at fault. What other components are left?? I would surely appreciate your input and again apologize for the off brand thread.
__________________
Willie White 1980 300SD 116 82 D engine and transmission If something can go wrong--it will 
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#2
11-22-2008, 12:34 PM
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Volvo splits the braking into 2 circuits for safety & redundance on the 240D: RF and LR, LF and RR, yours may be similar. I expect the soft circuit needs to be bled or has a leak.
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#3
11-22-2008, 01:12 PM
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Make sure the calipers are free to slide in their mounts. Calipers are designed to be self-centering over the rotor, but sometimes rust will cause them to stick in place. I usually sand off any rust where the caliper contacts the rigid holder and put anti-seize on the surfaces that have to slide.
If the piston has to move out some extra distance to get the pad to contact the rotor, it's going to act just like you have air in the lines.
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'81 300CD - 180K, cannot be killed by any conventional means '99 Ford Escort - good MPG
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#4
11-22-2008, 01:53 PM
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If bleeding the brakes does not help you might want to go to the Libray and read up on how your brake systems works.
Some Proportioning Valve/Pressure Differential Valves/Combination Valves have a valve that moves and cuts off the part of the brake circuit in case there is a leak. Follow your brake lined from the Master Cylinder Down and locate the Valve. See if it has a reset button or toggle switch on it to return the valve to the middle position (it needs to be returned or bleeding the brakes may not work). It may be that pushing your Brake Caiper Pistons back to install the new pads caused the Valve to move cutting off 1/2 of your breakimng system. I have a Volvo as the previous member describe and if you do not bleed the brakes exactly as the manual tells you; you will end up having to do it again the correct way (at least without a pressure bleeder). Also there may be a warning light on you Dash Board telling you that the little valve has moved. Other problems are the Spool valves inside of the Valve Bodies often have O-rings get hard and do not work properly and gunky Brake Fluid can plug up stuff inside of the Valve Body
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84 300D, 82 Volvo 244Gl Diesel
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#5
11-22-2008, 02:00 PM
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Quote:
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#6
11-22-2008, 02:52 PM
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Brakes pads sticking
1984 300d
replace all 4 brake hoses to release pressure
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#7
11-22-2008, 03:20 PM
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__________________
1981 300TD - SOLD 1981 Euro 300TD 4 sp. parts car 1982 300 SD - SOLD 84 300 TD 4 sp n/a 241K - SOLD
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#8
11-22-2008, 07:03 PM
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Off brand but---
Sorry -- the truck is a Rabbit in quite decent shape,tho it has more than 230K miles. the right front did have a "stuck" caliper and the outside pad was worn down to bare metal making it necessary to repl the disk and I did both disks on general principles. The rears are drum brakes which I didn't touch. The right side piston was pushed out most of the way but was returned without a problem. I did wire brush and lube the surfaces where the pads contact the caliper. I had no problem with uneven braking before repl the pads. Go figure. Thanks for your responses. Will post the answer when found.
__________________
Willie White 1980 300SD 116 82 D engine and transmission If something can go wrong--it will
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#9
11-30-2008, 01:04 PM
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As promised------ problem was solved by redoing the rear brakes. I had not touched them initially because they had been redone recently(in terms of miles) and they were not worn significantly but I suspect a hold down spring had come unhooked since that drum was a bear to remove. Replaced the shoes and hardware as a matter of principle.
__________________
Willie White 1980 300SD 116 82 D engine and transmission If something can go wrong--it will
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#10
11-30-2008, 01:44 PM
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If the truck has the valve in the back end like jettas did to provide changing fluid pressures to the rear brakes to avoid rear brake lockup they can be freaky and expensive to buy new.
I suspect when you were dealing with the back brakes somehow or other reverse pressure moved a piston in that valve restoring operation. That valve has a lever if present to the chassis to tell it when the rear end is lifting up I believe. Once again your vehicle may not have this valve setup but if it does you will notice two lines going into it and two lines exiting it. Plus the lever to the chassis.
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