Thread: Brake booster replacement/repair

Originally Posted by Lotz-A-Landies

Colin

They are only a 6" single diaphragm and IMHO, by today's standards inadequate (even by 1970's Aussie standards too), it is why in 1975 I fitted an 8" PBR booster from a Holden to my SIIa 109.

Cookey's mod is an improvement again because of the dual diaphragm, with the benefit of the OEM master cylinder.

Diana,

I run a Series I with standard brakes on full rego with no issues (except a little forward planning of any brake application). The standard servo and 11" brakes on a shorty will be a luxury in comparison.


Colin

its your choice, but my Defender with the same master cylinder as the late SIII runs an OEM booster which is either 9" or 10". So I guess that is another option.

My old servo has now been overhauled by Hydroboost http://www.hydroboost.com.au/

I had the option of linishing the outside to get a better finish (mine had a lot of rust pits) but decided against because it's not going to be a trailer queen.
Ended up having studs welded back in and a new pushrod made. Apparently it is the worst condition servo Terry has repaired.
Genuine parts used and cheaper than a pattern servo

Check out post 168 for pictures
http://www.aulro.com/afvb/showthread...58#post1890558

I have no association with Hydroboost other than as a satisfied customer.


Colin

Anybody have a link to write-up on the booster conversion on an early series 2A?

Also, am I correct to say the Series 2A used a shared reservoir between clutch and brake? Isn't that quite stupid? What option there for splitting that up?

Originally Posted by jakeslouw

Also, am I correct to say the Series 2A used a shared reservoir between clutch and brake? Isn't that quite stupid? What option there for splitting that up?

If you look inside the reservoir it is divided.

The fluid is shared until it drops to a certain level and then it is separated so the clutch & brake are independant. If the clutch hydraulic system leaks the level drops then the brake has its own supply while the rest of the fluid leaks out of the clutch hydraulics.

Single fill point but priority given to the brakes. Quite clever really.


Colin

Originally Posted by gromit

If you look inside the reservoir it is divided.

The fluid is shared until it drops to a certain level and then it is separated so the clutch & brake are independant. If the clutch hydraulic system leaks the level drops then the brake has its own supply while the rest of the fluid leaks out of the clutch hydraulics.

Single fill point but priority given to the brakes. Quite clever really.


Colin

Ah the plot thickens. No wonder I still had clutch when the RR slave cylinder self destructed on the way home after buying She Devil.

You can either go for a replacement using two plastic resevoirs or an original type is available

504105 - Brake and Clutch Fluid Reservoir Tank


Colin

Originally Posted by gromit

My old servo has now been overhauled by Hydroboost http://www.hydroboost.com.au/

I had the option of linishing the outside to get a better finish (mine had a lot of rust pits) but decided against because it's not going to be a trailer queen.
Ended up having studs welded back in and a new pushrod made. Apparently it is the worst condition servo Terry has repaired.
Genuine parts used and cheaper than a pattern servo

Check out post 168 for pictures
Isuzu C240 powered Series 3 - Page 17

I have no association with Hydroboost other than as a satisfied customer.


Colin

Hi Colin, have you been happy with the servo that Hydroboost did for you?
I'm looking at getting mine rebuilt or replaced and appreciate the feedback.
Thanks.