8.8 disk issues

[metman4ever]

I have a 1990 Ranger Supercab 4x4 with Rear ABS. I just put a 8.8 from a 96 explorer and have very little presure on the rear callipers. Do I need to upgrade the master cylinder to overcome the presure issue? I am also planning on swapping in a dana 44 front and would like to get a master cylinder that can handle everything and be rabs compatable. Is there one that will bolt right up to the existing booster?

 

[CopyKat]

I've never had problems with mine. You could upgrade to an F150 or 96 explorer master and try that.

I'm running the stock 87 master with the D44 calipers up front and explorer discs out back and I can lock them up if I wanted to.

 

[mjonesjr]

I've never had problems with mine. You could upgrade to an F150 or 96 explorer master and try that.

To upgrade to any Ford master cylinder that is after '95 i believe takes some extra modification. The pre-'95 Fords use standard threads on the brake lines where the post-'95 uses metric. That is the problem I ran into when I swapped the disc on the rear of my BII and needed more pressure to the rear.

Another problem is volume. The Explorers have a larger piston in the master cylinder putting more fluid volume to the disc.

 

[metman4ever]

I've never had problems with mine. You could upgrade to an F150 or 96 explorer master and try that.

I'm running the stock 87 master with the D44 calipers up front and explorer discs out back and I can lock them up if I wanted to.

Will these bolt right in?

 

[Sasquatch_Ryda]

The older f150 master cylinder bolts right up.

 

[metman4ever]

The older f150 master cylinder bolts right up.

What years should i look for?

 

[kevinsranger]

I have a 1990 Ranger Supercab 4x4 with Rear ABS. I just put a 8.8 from a 96 explorer and have very little presure on the rear callipers. Do I need to upgrade the master cylinder to overcome the presure issue? I am also planning on swapping in a dana 44 front and would like to get a master cylinder that can handle everything and be rabs compatable. Is there one that will bolt right up to the existing booster?

did you check the condition of the lines going to the rear axle? maybe the metal line is rusted or the rubber in pinched

 

[mjonesjr]

The older f150 master cylinder bolts right up.

They will bolt up, but the primary brake line hole is still metric. So you would still have to do some kind of modification to get the primary line to go into the F-150 master cylinder.

A 1987 F-150 master cylinder has a primary brake line hole of M18X1.5E and a secondary brake line hole of 9/16"-18. This is the first year the F-150 used the same style brake master cylinder as the RBV's.

 

[metman4ever]

I should also state that I have cruise and would like to keep it in picking a master cylinder.

The lines and rubber hoses all look fine.

 

[mjonesjr]

I should also state that I have cruise and would like to keep it in picking a master cylinder.

The brake master cylinder has nothing to do with your cruise control.

 

[Sasquatch_Ryda]

Yea on a 90 the cruise isn't part of the master cylinder, that is just the newer trucks.

As for the thread being metric, its not like its hard to get the correct flare nuts and reflare the lines.

 

[metman4ever]

Out of curiosity, could it be a bad RABS Valve?