92 RR Classic conversion to non ABS?

zolo

Explorer
I just picked up a good solid running, driving 92 RR classic county for $500 bucks.
Since it is a 92 and a "County" this gives it sway bars and ABS.
Ive done some searching and I know people have done the swap from the ABS system to the non ABS system.

Is there a good write up that explains this swap better? I.E. what year model booster and master cylinder are needed and what else is needed to comlpete this swap successfully.

Thanks for any help. The ABS system is currently not working Im pretty sure the pump is not making pressure and or the accumulator is bad.
All of the above cost more than the swap.
 

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d110pickup

SE Expedition Society
Zolo,
I don't think you need to swap MC or Boosters to eliminate the ABS.
Let me explain, the MC's bore & stroke is sized to actuate the calipers at a particular rate and difficulty and the booster is there to make this doable while applying less pressure to the pedal.
I think you can eliminate the ABS pump & electronics on that particular model by removing those parts and running new hard lines as required.
I don't think the ABS has any effect on the size of the MC or booster.
Please let us know how this works.
Mike
 

Scott Brady

Founder
On my Discovery I, I just interrupt the fused power to the ABS and run in non-abs mode. I use a switch so that I can power it if desired, but find the system works excellent without ABS. I would just run it as is and not worry about replacing the parts or converting.
 

David Harris

Expedition Leader
On my Discovery I, I just interrupt the fused power to the ABS and run in non-abs mode. I use a switch so that I can power it if desired, but find the system works excellent without ABS. I would just run it as is and not worry about replacing the parts or converting.

Yes. My RRC doesn't have ABS, but I run my Disco without ABS by just pulling the fuse. Do this and try it out. Scott's switch idea is a good one, if you want to fix the ABS and turn it on and off. Otherwise, you can just get the master cylinder for a non-ABS and install that with new brake lines and you have a non-ABS truck. The calipers, rotors, etc. are the same for ABS and non-ABS on this year.

David
 
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zolo

Explorer
The ABS on the 92 is a non pass through system. The pump and accumulator make the system have "power"
I would just remove the parts but since there is no booster present and the master is the ABS module without the use of the pump and accumulator and pressure switch the ABS will not allow the fluid to pass through there is no pass thourgh to the powered side of the front calipers and there is no pass through to the rear calipers with out the ABS working there are no brakes

The 92 is a stand alone rare beast. Its not so simple to just pull the fuse or remove the parts.
 

Michael Slade

Untitled
Pull the pump off, take out the impeller and the roller bearings, clean them up with a scotch-brite pad and some brakecleaner and put it all back together. It'll work. I have done this on many RRC's.
 

zolo

Explorer
On my Discovery I, I just interrupt the fused power to the ABS and run in non-abs mode. I use a switch so that I can power it if desired, but find the system works excellent without ABS. I would just run it as is and not worry about replacing the parts or converting.

That would be a great idea but the ABS system on this Classic is not a pass through system. So without the ABS working NO fluid gets to the calipers.

There is a fail safe in the system that allows fluid to get to two of the pistons of the front calipers when the ABS fails. This allows slowing down but not great at stopping.

Its a strange design.

The conversion seems like an easier and less exspensive way to get reliable brakes.
 
Non-ABS conversion

It's my understanding that one could just source an earlier vacuum boosted system ( master cylinder and booster ) from say a late '80's Classic and fit it.

This is was hoping to do with my '90 Classic that has 'pedal kick back'.

The ABS was a mess when I got the truck and I cleaned all the sensors, wire connections and bled the system, replaced the faulty Accumulator and all the issues went away except the 'kick back'.

Next step is power bleeding with warm brake fluid and crossing my fingers. If this doesn't cure the kick back I will also be going to an old school vacuum boosted set up.
 

I Leak Oil

Expedition Leader
If I were to rebuild the system on my '88 RRC again I'd find a domestic MC (GM?) or a hydroboost to fit it. Cheaper and easier to find here.
 

d110pickup

SE Expedition Society
The ABS on the 92 is a non pass through system. The pump and accumulator make the system have "power"
I would just remove the parts but since there is no booster present and the master is the ABS module without the use of the pump and accumulator and pressure switch the ABS will not allow the fluid to pass through there is no pass thourgh to the powered side of the front calipers and there is no pass through to the rear calipers with out the ABS working there are no brakes

The 92 is a stand alone rare beast. Its not so simple to just pull the fuse or remove the parts.

Sorry, I stand corrected.
Mike
 

zolo

Explorer
It's my understanding that one could just source an earlier vacuum boosted system ( master cylinder and booster ) from say a late '80's Classic and fit it.

This is was hoping to do with my '90 Classic that has 'pedal kick back'.

The ABS was a mess when I got the truck and I cleaned all the sensors, wire connections and bled the system, replaced the faulty Accumulator and all the issues went away except the 'kick back'.

Next step is power bleeding with warm brake fluid and crossing my fingers. If this doesn't cure the kick back I will also be going to an old school vacuum boosted set up.

Your understanding is correct but what year? what other parts are needed? Do you have to swap the pedal assembly? What perportioning valve do you use. How do you convert from the dual line front calipers to the single outlet master. Those are the questions I need help with.

I can get the booster and MC from a earlier truck for $150 but what else is needed?

What is easier, fix it? or convert it?
Fix it is easier.
What is less exspensive?
Convert it?

The pump is made out of a rare metal that is no longer found on earth....
so if I need a pump I also need a spaceship perhaps.
 

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