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New dual system masterbrake cylinder

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ChristianWerner

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Hi!
I need to rebuild my brake servo at my Bj7. But in the catalogue from Anglo Parts i read about their dual brake master cylinder. They say that with this cylinder you don't need a Brake Servo, what i can't understand. I don't know if i should rebuild the servo because it looks very badly or if i change the system to a dual system what also would be more secure.
Has anybody changed the brake system to a dual system or has any expirience /ubbthreads/images/graemlins/confused.gif /ubbthreads/images/graemlins/confused.gif?
Thank you very much for help!

Christian
 
Hi Christian,I am aware that the early Land Rover dual brake master cylinders have been used on the Healey cars.From a reliabilty standpoint a dual system is more "secure".I can not comment on the lack of a booster if you go this route though.---Fwiw--Keoke
 
Smitty (of Toyota trans conversion fame) had put dual masters and Wilwood calipers on one of his Healey’s. He said he wasn’t happy with the way it stopped at the time I saw it. Maybe he’s figured it out by now. Anyone still in contact with him since he retired?
 
Smitty may have needed proportioning valves which he may not have installed Greg.?---Keoke
 
This seems like a good idea. Would the proortioning valves not be part of the Rover MC? If not what kind would you use and where would you get them? I saw an article on the AH 100 Restoration web site about converting to a dual system, but it realy looked complicated.
 
Hi Keoke,
To be honest, I can’t remember if he had proportioning valves, or utilized a balance bar, or none of the above.
 
I do not know what Smitty did either it was just a hunch Greg. Richard, the nicest Proportioning valves I have run across can be found in the P1800 series of the Volvo cars.---Keoke
 
Just as an fyi - because it was a discussion on the Triumph board recently, I was wondering if anyone had tried the Summit MC. It's dual and only about $125. They have servos that are cheap too, but of course a long way from being stock.

My interest here is to see how they perform...
 
Hi,
i think now i am at the point that i'll let it be, maybe i'll buy a new brake servo or i'll rebuild the old.
The "Dual circuit brake master pump" from Anglo Parts seems to be made for Healeys. It has a 18mm front pump and a 19,1mm rear pump for the balance. But the bad part on it is that the price is about 311€. For this price i get a new servo.
I think it is like windows, never change a running system.

see you
Christian
 
[ QUOTE ]
Hi!
They say that with this cylinder you don't need a brake servo, what I can't understand.
Christian

[/ QUOTE ]
All master cylinders are a trade off between pedal pressure & pedal travel.

A smaller master cylinder bore, for given wheel cylinder sizes, will give more hydraulic pressure for the same foot pressure, but require more pedal travel. A larger bore will require less pedal travel but more foot pressure. Hydraulic leverage. It would be possible to have less foot presure but at cost of more pedal travel. In some cases, an acceptable trade. Some folks feel that the Healey servos cause the brakes to be a bit too sensitive.
D
 
[ QUOTE ]
Some folks feel that the Healey servos cause the brakes to be a bit too sensitive.
D

[/ QUOTE ]

Why were servos fitted to BJ cars but not earlier ones, and given the servo's propensities to leak, etc. why do people not remove them? I'm sure there is some additional weight associated with the convertibles versus the roadsters but is much greater braking effort needed for them?
 
[ QUOTE ]

Why were servos fitted to BJ cars but not earlier ones, and given the servo's propensities to leak, etc. why do people not remove them?

[/ QUOTE ]
Good question,
I suspect that the later cars were intended to appeal more to the ladies who might not like hard brake pedals. Who knows? It kind of fits with the wood paneling, windows, & such. More luxury. Bet they would have added power steering if it was possible.
D /ubbthreads/images/graemlins/tongue.gif
 
There is a good article in the Jan. Healey Marque Magazine by Jack Brashear on adding a servo based on a servo from a hot rod supplier and other parts from NAPA. It still doesn't solve the dual MC problem. If anyone has actually tried a system with more or less bolt on parts that doesn't require a balance bar, I would like to hear about it. Braking without a booster is adeequate for me, but any thing that adds to saftey(i.e. dual MC) or reliability is a priority with me.
 
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