G-Class Alterantive Brake Booster
I wonder if there is any brake booster could replace the original G class brake booster (Bremskraftverstärker) ?
Sorry only a G-Wagon booster will fit. If you want to attempt a different vehicles' booster then you will need to fit an adapter fabricated to fit. The fabrication will need to mate the servos fitting and pedal box fitting and at the same time making sure the seal sitting for the master cylinder is sound. Lastly, the extended length need to be factored to the master cylinder rod.
Alternatively you could try having it repaired. I found one link for you who claims they can repair,
http://www.jlspares.co.uk/contact.htm
They will need details of servo and vehicle year.
I`m considering replacing it with BMW 7 booster: http://www.ebay.co.uk/itm/121345193769
MB double membrane has electronic in it. BMW from 7 series has simple double membrane booster and can be maybe even better for stopping G.
The fact a double membrane in the BMW brake servo does not necessarily relate to improved braking. It could be that the designer has had to use a double membrane in order to compensate for limited space and within that space has had to deliver more force by the servo given the design to meet the vehicles braking force.
The G-Wagen has the space hence its large servo body and single membrane use.
The question that needs to be asked is what is the ratio of brake assistance applied by the servo for a given force applied at the brake pedal? I do not know the answer to that nor do I know how to go about checking for that bit of information. So how is it you are deciding just because the BMW servo is multi-membraned it will be better than the G-Wagen one. Perhaps it is but without facts and figures this is a baseless assumption.
If you use a hydraulic assisted brake servo such as the one used in some Audi’s or VW models these are more efficient than vacuum servos but adaptation of the system is a problem or no easy task. Again we do not know how much more assistance over the standard G-Wagen system these system are?
Useless as my contribution is, it has left an unanswered question and more questions to answer for. We need a vehicle engineer for this one, don’t know if we have any skills’ of a designer within the club. If so, please take courage and take the floor.
It was not originally my idea, another local G fanatic suggested me to try, and he already bought it to put on his G.
When I swapped my old small original w460 first year brake booster to new one from w463 and changed all braking lines, all was working near perfect in regards of stopping, No more stopping like school bus... It works good. But want something new to try and because those big boosters works on w463, BMW can be maybe cheaper solution.
Anyway my G is so far a part, that almost make sense go for bigger restoration and it will be lot of time after I can test BMW brake booster on my w460.
Please don't get me wrong. I am only against the idea because I do not know how to get information in order to answer your query. The idea is not bad in principle but if you say the W463 system works better then I would it to expect it to work better as it is an upgrade to the W460 system. At least there you are generically upgrading but when you want to adapt using other vehicle donor parts then you do need more information.
I am not promising but I will try to look into this topic in more detail. Besides brake servos the other area one can upgrade is larger bore master cylinders but in this case one needs to know the base figures for G-Wagen master cylinder dimensions and fluid pressures input and out put figures to be able to make comparisons to.
In doing this sort of work remember, at least for UK modifiers is how the Insurance companies will look upon these types of modification in particular to Road use vehicles. If it for solely for off road use then the same concerns may not apply.
LATE ADDITION:
Some reading material in the braking field that could be of some use.
Brake boosters:
http://www.trw.com/sites/default/files/TRW_braking_Dual%20Rate%20_DR__En...
Brake pedal ratios:
http://www.piratejack.net/index.php?option=com_content&view=article&id=1...
http://dev.stoptech.com/docs/media-center-documents/pedalsetup-dualmaste...
Untitled:
http://www.pirate4x4.com/tech/billavista/Brakes/#BrakeTorque
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Thanks Pistonhead for your usual support
Only today I found your reply.Im no longer getting notification about the new messages.May be there is a certain setting need to be done in my group account.
Brake pedal ratio means you can't replace your master cylinder with a smaller one in the bore diameter.
What is the ratio for the 460 / 461 ?
Aymanj