Powermaster Brake Assembly

the hamiltons

New member
Dec 16, 1997
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Tom,

The Powermaster was used on 1986 Lesabre and Electra Estate Wagons and
1985-87 Regals with 3.8 L SFI Turbo. They require a special adapter and
some modification to be used on the GMC.
Al Hamilton
Kingston, Ont

hamilton
 
>
> The Powermaster was used on 1986 Lesabre and Electra Estate Wagons
> and 1985-87 Regals with 3.8 L SFI Turbo. They require a special
> adapter and some modification to be used on the GMC.

OK, I'll show my ignorance. What is a Powermaster Brake Assembly? I've
never heard of it.

Patrick
- --
Patrick Flowers
Mailto:patri63

The GMC Motorhome Page
http://www.gmcmotorhome.com
 
Pat the powermaster unit is actually a master cylinder, designed by GMC,
with its own 12 volt motor that puts out tremendous pressure to the brakes.
Vacuum is no longer needed. Very light pressure on the brake pedal will
generate tremendous forces at the wheel cylinder. Supposed to be fantastic
braking action for the GMC coach. I want to try one! it is listed in the
GMC Motorhomes International newsletter.

>>
>> The Powermaster was used on 1986 Lesabre and Electra Estate Wagons
>> and 1985-87 Regals with 3.8 L SFI Turbo. They require a special
>> adapter and some modification to be used on the GMC.
>
>OK, I'll show my ignorance. What is a Powermaster Brake Assembly? I've
>never heard of it.
>
>Patrick
>--
>Patrick Flowers
>Mailto:patri63
>
>The GMC Motorhome Page
>http://www.gmcmotorhome.com
>
>
 
>
> The PowerMaster replaces the master cylindar and the vacuum booster
> assembly. It is a electrical pump device that produces sufficiently
> higher brake fluid pressure to give your brakes much more sensitivity
> approaching the effectiveness of a car's brakes. Assuming of course
> that the rest of the system is functioning as it should.
> I've had one for several years now.

You folks have piqued my curiousity now. I'll have to scrounge some
salvage yards next week. Anybody want to put together an article(with
pic's) for the "Tech" page?

Patrick
- --
Patrick Flowers
Mailto:patri63

The GMC Motorhome Page
http://www.gmcmotorhome.com
 
Justin

Bob Lamey does the work. 1-909-982-7747. Just talked to him
yesterday. $175 with a one day turnaround. Will not ship new one
cant get cores. You must send in yours.

Take Care
arch
DeSoto IL
~~~~~~~~~~~~\____/~~~~~~~~~~~~~
www.gcbr.com

- ----------
> From: CHill113
> To: gmcmotorhome
> Subject: Re: GMC: Powermaster Brake Assembly
> Date: Friday, June 05, 1998 9:10 AM
>
> Jim
> Thanks for your comments on sensitizing the booster. I have heard of that
and
> I think some of the folk in our club have done it. If it had been
available
> back when I put on the PowerMaster, I guess I would have gone that way.
> Ironically the junk yard powermaster was much more sensitive than the new
> replacement I bought from Gm. Can you tell us who will perform this
> 'sensitizing' of the booster?
> Justin
 
>
> Patrick
> The PowerMaster replaces the master cylindar and the vacuum booster assembly.
> It is a electrical pump device that produces sufficiently higher brake fluid
> pressure to give your brakes much more sensitivity approaching the
> effectiveness of a car's brakes. Assuming of course that the rest of the
> system is functioning as it should.
> I've had one for several years now.
> Justin

Justin,
The power master system has been adapted to the GMC to try to improve
sesitvity of the system and I have heard that it works. I have also
seen a meriad of problems and complaints associated with the system.
The trouble shooting web site attests to this, but the idea is a good
one.

In contrast to this system, there is a process called "sensitising" the
brake booster that is less complicated to install and will produce
similar results. A sensitised booster was primarilly designed for the
handicapped mobility industry to give a sensitive brake pedal for those
folks that have trouble press hard on the pedal.

The OEM brake power booster is internally modified to the more sensitive
specifications and is reinstalled as an OEM booster would be. I have
had reports that the system works fine in our motorhome and drivers
report the have confidence in the system and feel safe driving with it,
and as far as brakes go is what I'm looking for.

If anyone would like more info on this system, Email or call me toll
free at: 1-877-275-4462

Remember, today is "free Friday " for my tech line, it doesn't cost you
and it doesn't cost ME, so lets hear from you!

Jim Bounds www.gmccoop.com
 
Leigh Harrison (703-494-9914) also sells sensitized boosters.

Paul Bartz
> From: Richard Archer [SMTP:arch]
> Sent: Thursday, June 04, 1998 11:02 PM
> Subject: Re: GMC: Powermaster Brake Assembly
>
> Justin
>
> Bob Lamey does the work. 1-909-982-7747. Just talked to him
> yesterday. $175 with a one day turnaround. Will not ship new one
> cant get cores. You must send in yours.
>
> From: CHill113
> Subject: Re: GMC: Powermaster Brake Assembly
> Date: Friday, June 05, 1998 9:10 AM
>
> Jim
>
> Thanks for your comments on sensitizing the booster. I have heard of
> that and I think some of the folk in our club have done it. If it had
> been available back when I put on the PowerMaster, I guess I would
> have gone that way. Ironically the junk yard powermaster was much
> more sensitive than the new replacement I bought from Gm. Can you
> tell us who will perform this 'sensitizing' of the booster?
>
> Justin
 
They can be purchased completely remanufactured at you auto parts store for
$295. They were on 1986 lesabre and electra estate wagons.

>Leigh Harrison (703-494-9914) also sells sensitized boosters.
>
> Paul Bartz
>> From: Richard Archer [SMTP:arch]
>> Sent: Thursday, June 04, 1998 11:02 PM
>> Subject: Re: GMC: Powermaster Brake Assembly
>>
>> Justin
>>
>> Bob Lamey does the work. 1-909-982-7747. Just talked to him
>> yesterday. $175 with a one day turnaround. Will not ship new one
>> cant get cores. You must send in yours.
>>
>> From: CHill113
>> Subject: Re: GMC: Powermaster Brake Assembly
>> Date: Friday, June 05, 1998 9:10 AM
>>
>> Jim
>>
>> Thanks for your comments on sensitizing the booster. I have heard of
>> that and I think some of the folk in our club have done it. If it had
>> been available back when I put on the PowerMaster, I guess I would
>> have gone that way. Ironically the junk yard powermaster was much
>> more sensitive than the new replacement I bought from Gm. Can you
>> tell us who will perform this 'sensitizing' of the booster?
>>
>> Justin
>
>
 
Arch everyone should be replacing all of the brake lines by this time. I am
in the process of rebuilding the complete brake system form one end to the
other. new calipers, disks, wheel cylingers, metering balance assy and all
hoses. Now is the time to make the decision on how to go!

>In a message dated 98-06-05 18:32:39 EDT, you write:
>
> They can be purchased completely remanufactured at you auto parts store for
> $295. They were on 1986 lesabre and electra estate wagons.
>
> >>
>
>GMCnetters
>
>I dont want to throw any cold water on this whole thread. I have been
>doing some research on the Powermaster Brakes. Since I have replaced
>my brake lines I consider this a real option for me. These puppys develope
>some real high brake line pressures. When I took off my old lines the
>one across the boggie crumbled trying to get it off. There was another
>spot along the rear frame that broke. When I put my new brake lines
>in I put a piece of plastic tubeing around the line then clamped it
>down. This kept the line off the frame and the boggie. Dirt and
>stuff wont build up as bad as before. ANYWAY, I would be real
>careful putting one of these units on a rig with 20 yr old brake
>lines on it. I would sure change out any cracked rubber lines.
>
>I know I am starting to sound like Wes BUT I cant help it.
>
>Take Care
>Arch
>
>
 
>
Justin,
Actually, the boosters are modified and are available exchanged through
Leigh Harrison and myself. They cost $175.00 plus $50.00 core charge
which will be returned to you when we receive a core GM booster.

You can get more sensitivity without the elaborate modifications. This
unit is a bolt on replacement for the OEM booster.

Give me a call on monday if you are interested. 1-877-275-4462

Jim Bounds www.gmccoop.com

> Jim
> Thanks for your comments on sensitizing the booster. I have heard of that and
> I think some of the folk in our club have done it. If it had been available
> back when I put on the PowerMaster, I guess I would have gone that way.
> Ironically the junk yard powermaster was much more sensitive than the new
> replacement I bought from Gm. Can you tell us who will perform this
> 'sensitizing' of the booster?
> Justin
 
Arch,
Hey, that is a great pick up! The brake lines are badly neglected until
you strike oil one day standing on the brake and reafirm your religion!
The hoses too need more attention. If your rear hoses are swolen at the
end, you had better replace them soon. The swell is a rusted cremp and
will give you no warning before she blows. Golby has reproduced a
really nice hose, give them a call. The front hoses have a tendancey to
colapse and should be replaced at the same time, you can pick them up
locally (part # is BH36675).

Again, thanks for keeping the big picture in focus.

Jim Bounds www.gmccoop.com

>
> In a message dated 98-06-05 18:32:39 EDT, you write:
>
> They can be purchased completely remanufactured at you auto parts store for
> $295. They were on 1986 lesabre and electra estate wagons.
>
> >>
>
> GMCnetters
>
> I dont want to throw any cold water on this whole thread. I have been
> doing some research on the Powermaster Brakes. Since I have replaced
> my brake lines I consider this a real option for me. These puppys develope
> some real high brake line pressures. When I took off my old lines the
> one across the boggie crumbled trying to get it off. There was another
> spot along the rear frame that broke. When I put my new brake lines
> in I put a piece of plastic tubeing around the line then clamped it
> down. This kept the line off the frame and the boggie. Dirt and
> stuff wont build up as bad as before. ANYWAY, I would be real
> careful putting one of these units on a rig with 20 yr old brake
> lines on it. I would sure change out any cracked rubber lines.
>
> I know I am starting to sound like Wes BUT I cant help it.
>
> Take Care
> Arch
 
I just came back from a visit to my local Buick dealer and he pulled up drawings
and part numbers on his computer for the Powermaster unit for a 1985-87 Regal
with the 3.8L SFI Turbo. He kindly printed out the drawings and parts listings
including one showing the entire assembly including the pedal mounting
components.
He said the price for everything, call part numbers 1 thru 39, was $1298. In the
interest of my financial situation, I'm going to check with some local parts
emporiums to see what they have and then consider rebuilding whatever it might
need.

Many thanks to everyone who put some info on our list about brakes. My feeling is
that while it is nice to have a motor home that starts and runs well, it is
essential that it stop quickly when necessary. That is my goal before taking ours
on any trips.

Ralph Edelbach, '74 Glacier