1982 ford tow truck brake question?

Question

all 4 wheels are drum brake,not power brake,the master cylinder lid leaked,so i replaced the master,still leaks, all 4 wheels bled good,feels like front brakes are working only,the leak, i still say faulty master, but for the other problem, would u think its the proportioning valve,I cant find one NO WHERE, not even ford garage. any help would be appreciated.

2013-08-05T05:23:47Z

for some reason this truck has an proportion valve,regardless of drum brakes al way round,its bolted almost underneath the master cyl.

? · Answer

actually a proportioning valve is needed where  possibility of  rear wheel locking up when heavy braking. so in cases of light and heavy  vans etc  will be fitted and in some cases on cars. 
   if this is faulty it ought to fail in effect having  no proportional braking  or incorrect  hence rear wheel lock up when braking? or maybe  very poor rear brakes.
  ford main dealer ought to be able to assist..if they cannot?  ask for  customer assistance/ relations phone number. this is a number  dealers can  phone  directly to engineers  at Ford support centre who are tasked with resolutions of customers technical issues where a dealer is  unable to  solve  etc.
   sounds to me as though master cylinder is at fault again.. fluid leak by on seals  ought to be only way fluid is  getting back and  over filling master reservoir.
  di check out  piston head site for  advise. some of these guys  know  a few things.

1982 ford tow truck brake question?

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