rear disc brakes

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87 rocket

Not-quite-so-new-guy
Sep 17, 2018
8
0
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87 cutlass rear disc brakes added have lil brake fluid to rear, blead brakes front brakes ok. what do i have to do to get more fluid to rear brakes? proportion valve or new master ?any input would be great thanks in advance.
 

81msw79

Master Mechanic
May 5, 2013
391
124
43
roselle park , nj
what disc brakes setup are you running? most rear disc require a proper disc/disc prop valve. the one for the factory disc drum setup does not work properly.
 

87 rocket

Not-quite-so-new-guy
Sep 17, 2018
8
0
1
ford 8.8 rear came on car when i bought it. found out they are 1994-2004 mustang cobra front calipers. all new parts lines , hoses only never changed proportion valve or master cylinder, still has gm master cylinder .
 
Apr 9, 2017
151
190
43
Las Vegas, Nevada
ford 8.8 rear came on car when i bought it. found out they are 1994-2004 mustang cobra front calipers. all new parts lines , hoses only never changed proportion valve or master cylinder, still has gm master cylinder .
The 2000 Blazer S10 MC, Duralast p/n NM3068, is a direct bolt in swap that is for a factory 4 wheel disc application.
 
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Reactions: 1 user
Apr 9, 2017
151
190
43
Las Vegas, Nevada
Needs the proper proportioning block, not different brakes....smh
If you add disc brakes where there used to be drums you need more than just a proportioning valve. Cylinder displacement has changed which will require a proportioning valve unless a master that proportioned properly is used. If not using a stock set up from another vehicle there is no way to tell if the brakes are proportioned correctly so I agree with you there. however, residual vales will also be needed because drum brakes release under spring pressure after the pedal is released. This characteristic requires the rear to be pumped up making them feel like they aren't working. A proportioning valve won't fix this.
 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
19,990
113
Socialist NY
3068NM durlast autozone part number is no gooooooooood

 

TURNA

Rocket Powered Basset Hound
Jul 24, 2009
10,941
19,990
113
Socialist NY
Burnouts have you tried ACDelco 18M974
 
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