Miles Posted September 3, 2002 Share Posted September 3, 2002 After installing all new rear brake parts on my 72 240Z I have had a problem with the right rear locking up when making an emergency stop. The OEM shoes have about 200 miles of city driving on them. So I backed out the right side adjuster and now the left rear tends to slightly lock up and pedal travel has increased. I was thinking I should just slacken the adjusters all the way loose and use the hand brake to adjust the shoes and not mess with the adjusters at all. Also, on this car the front brakes,new with about 200 miles on them, will not lock at all. The master cylinder is new OEM. We have put about a gallen of Ford brake fluid through the system and no air bubbles are present. Any ideas would be appreciated. Thanks Miles Quote Link to comment Share on other sites More sharing options...
Mike C Posted September 3, 2002 Share Posted September 3, 2002 In my experience, using the hand brake when the brakes are FAR out of adjustment doesn't work. You will NEVER get good pedal feel from a 240 brake system if the rears are not adjusted out as far as they'll go without dragging. I would readjust the rears, and put some more miles on it. I don't recall, are the pads the same f/r or different? My GM vehicles have a different pad on the leading edge vs. the trailing edge so make sure you don't have them swapped or both the long ones on one side and shorts on the other. Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Share Posted September 3, 2002 There is a leading and trailing shoe(for each side)so they can only go on correctly! How old are the wheel cly.? How old / bad is the brake fluid? Again ajust the rears(w/ the rear off the ground) Did you cut the drums? Are they in good shape? Is 1 of them cracked? Have they been cut to much already / one cut more than the other? If you haven`t, you might want to do a 4 wheel brake fluid flush! Make sure you bleed out the master cly also! Quote Link to comment Share on other sites More sharing options...
Miles Posted September 3, 2002 Author Share Posted September 3, 2002 Mike The rear shoes have a leading and trailing shoe. I installed them per my manual and compared them to my other 72 240Z. The install looks ok. Also, the fronts just will not lock up. I don't have the tools or tubing knowledge to install a proportioning valve so I may have a speed shop install one or find someone who could make me up a complete bolt in kit. I was planning on removing the stock PV and attaching the new adjustable PV to the old stock PV lines in the rear and then mounting the new PV in the passenger side tool box. If someone could make me up a kit with PV, flared pre-bent tubing,and adaptor fittings would be preferable to paying a speed shop to do the work. Thanks Miles Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Share Posted September 3, 2002 Try cking the frt calipers, using some slip-joint plires, see if you can depress both pistons in each caliper!(careful not to pop a piston out) Quote Link to comment Share on other sites More sharing options...
Miles Posted September 3, 2002 Author Share Posted September 3, 2002 Doug All parts front and rear except the stock proportioning valve and the connection block located under the MC are new OEM parts. The MC is new OEM also. I have tried to adjust the rear shoes to just short of dragging, then the right or left wheel will lock up under hard braking . Miles Quote Link to comment Share on other sites More sharing options...
Miles Posted September 3, 2002 Author Share Posted September 3, 2002 BTW... what is the procedure for bleeding the MC? Thanks Miles Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Share Posted September 3, 2002 Miles, where is your PV? Is it in the engine compartment or in the rear? Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Share Posted September 3, 2002 Always bleed MC first, then go to rear(where brake line is the longest) bleed that side, then other side, go back to frt, bleed right frt then left frt! Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Share Posted September 3, 2002 There should be 2 bleed valves on side of each cly(on MC). Bleed one at the time! Bleed a fair amount of fluid thru each one! Quote Link to comment Share on other sites More sharing options...
Miles Posted September 3, 2002 Author Share Posted September 3, 2002 Doug PV is mounted in the rear. Miles Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Share Posted September 3, 2002 Well, you can take it off - 1 take it apart and clean it! 2 remove it, run new line and then mount a PV inside pass compartment where you can get to it to ajust it! I`m sure you should be able to find someone in your area to help(if you need it). It`s not hard, but you will need some tools, a tubing bender and a tubing flare kit! Quote Link to comment Share on other sites More sharing options...
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