OMG brake upgrade!!!!!!

[76 PTO]

I have recently gone down the path of a brake upgrade and the results are amazing. I have a 76 with stock front disks.

Parts list.
94 non abs master cylinder
89 mini truck booster with Racers adapter.
Posers brackets with montecarlo calipers.
Racers adjustable proportioning valve.
90 chevy 1/2 ton rotors.

I just took it for a test drive and it will throw you through the dash with the slightest touch of the pedal. I need to adjust the rear a little more. I almost need to dial it back a little!!! I highly recommend this upgrade. Both posers and Racers parts are top notch.

 

[bikersmurf]

What vehicle did you source your master from? 80 series Cruiser?

I'm running an '89 80 series 4 wheel disc booster, 40 series fronts, and Chevy Blazer rears... the results are equally impressive... almost too strong (if that could be possible),

 

[Josie'sLandCruiser]

No disrespect intended, but are you sure bikersmurf ? The 80 Series didn't hit the market until 1990. And the 80 Series didn't get 4 wheel disc brakes until 1993 (U.S. market) IIRC.

Regards,

Alan

What vehicle did you source your master from? 80 series Cruiser?

I'm running an '89 80 series 4 wheel disc booster, 40 series fronts, and Chevy Blazer rears... the results are equally impressive... almost too strong (if that could be possible),

 

[76 PTO]

Yes a 94 non abs 80 series master cylinder.

 

[76 PTO]

I'm going to have to get used to it. There is not much pedal feel.

 

[want2wheel]

You can adjust the rod between the booster and the MC. It might be to long not giving you enough "play."

 

[Mr Cimarron]

The non ABS 80 series MC is awesome. At first I went through two 60 series MCs and didn't like it. Everyone should just go straight to the 80 MC if going front disc. 40 stops better than my 80 now.

 

[76 PTO]

There is a gap between the pedal and the rod now. I thought that was all you needed to be adjusted correctly.

 

[Bluegrass40]

I did this same conversion. The first time I went ou, I locked up the back the first time I touched the brakes. Then I dialed the proportioning valve way back and recalibrate my foot. All is good now. Stops like a champ!

I intentionally did not put much of any gap between the booster rod and the mc piston. From what I read and understand, you want there to just be contact between the two when there is nothing on the pedal.

Enjoy!

 

[Downey]

(A) If there is not a slight gap between booster push rod and master cylinder, you could be slightly applying the brakes all the time, which would lead to frying the front brakes after a few short freeway miles.
(b) You can easily use an ABS master cylinder on a non-ABS equipped vehicle, just plug the ABS port, then it works identical to a non-ABS master cylinder.

 

[76 PTO]

There is a gap between the pedal and the rod now. I thought that was all you needed to be adjusted correctly.

 

[LAMBCRUSHER]

should be..there is a spec on that clearance. I thought it equated to 1/8" of an inch, but it's been a LOOOONG time since I was in there...

 

[76 PTO]

I know I need to dial back the rear a little. The gap between the booster and master is the same as the stock setup. I measured it with calipers. I don't think the rod is too far because the brakes are not hot just cruising. If it is still too touchy after I adjust the rear I will dial back that rod a little.

 

[want2wheel]

I adjusted mine out all of the way and turned it in slightly. Did you replace your other rubber lines? It will not cause the issue that you are having, but now would be a really good time to do it.

 

[Tools R Us]

...
(b) You cash easily use an ABS master cylinder on a non-ABS equipped vehicle, just plug the ABS port, then it works identical to a non-ABS master cylinder.

The 80 series ABS master doesn't have an extra port, nothing to plug. The non ABS 80 series has front disk, rear drums, the ABS has 4 wheel disk.

 

[Cruiserdrew]

There is also an 80 series master that is disc/disc non-abs master that works well:

Amazon.com: ADVICS BMT-090 Brake Master Cylinder: Automotive

 

[Mr Cimarron]

There is also an 80 series master that is disc/disc non-abs master that works well:

Amazon.com: ADVICS BMT-090 Brake Master Cylinder: Automotive

That's the one I got. I originally tried to use a spare ABS version I had laying around but couldn't adjust the rears to my liking.

 

[76 PTO]

I've dialed the rear back as far as it will go and they still lock up first. I still need to adjust the rod back a little to give me some more pedal travel.

 

[Mr Cimarron]

Did you try adjusting the rear shoes back a click or two to see if that helps?

 

[bikersmurf]

No disrespect intended, but are you sure bikersmurf ? The 80 Series didn't hit the market until 1990. And the 80 Series didn't get 4 wheel disc brakes until 1993 (U.S. market) IIRC.

Regards,

Alan

To be sure I'd have to do some digging... I could be off on the year. I've got a pic of the vin plate of the JDM truck it came out of... it wasn't a Domestic market rig.

What I do know for certain is that it was a diesel RHD 80 with 4wheel discs... with its booster and master the brakes seemed grabby till I recalibrated my size 13/14 foot. It'll lock up all 4wheels at 30 mph with a sharp jab on the pedal with two fingers I'm sure it'd stop a 4600 lb rig like mine with bigger tires than my 33x10.50s with almost no effort. If I ever get my Scout II P/S installed your grandma could show off to all her friends in bridge club.