Brake Booster Re-Build

What's wrong with the booster? A booster is a simple tool to assist the brake pressure. Google to how stuff works, I bet it's explained there.

Most failures are: broken check valve or vacuum hose. ( those things are external, so no need for dismantling).

A booster is nothing more than a tin box with a loaded spring against a rubber gasket who divides the box in 2.

I my opinion: if you want an other: buy it second hand or look for a gasket. The 2 halves could be seperated to bend all the sides a bit more open with some pliers and turn half an inch to unlock.

This is the least difficult part of a car.
I'm sure you can handle it yourselve.

 

I'm getting a deja vu

http://www.ferrarichat.com/forum/mondial/430999-brakes-booster-vacuum-assist.html

Besides what Bart is saying. Agree on what he says though.
If you would want to let it be rebuild 300 USD is a fair price in my opinion. Most of this stays manual labour that needs to be paid depending if you take it off yourself to be rebuild. The parts would not be more then 50 to 100 USD.

 

What says Ferrari's prontuario tempi on the rebuild of a booster? 50€ for parts, and 250€ on labour???? I rebuilded my master brake cylinder & booster of the Lancia + mounting in the car + bleeding the super duplex system in an afternoon. (It was the first time I did this, so it could be done faster)

I looked in the workshop manual for clear explanation, but there was aparantly no ( italian) interest for any info on the booster.

 

Most rebuild kits are around the price of 75€/USD Labor rate of a mechanic per hour is about 50 to 60€(VAT not included). My guess is that it is the same in USD for our fellow US owners. The Mondial Brake booster is not that easy to take off to be honest Took some patience.. ...and some nasty words hahaha

but this is doable yourself indeed!

 

You have rubber and rubber Might be that the 250 USD guys use an inferior type of rubber and parts material. This is just crossing my mind knowing that having quality rebuild parts is costing somewhat more.

Ask what kind of kit they use and what it would cost if you do it yourself. This way you know at least the price difference in the kits they use.

HTH
Tijn

 

If the rpms change I think check valve is messing with you: it should only be one directional. The blow off is to the open air.

If you are gonna send it over for overhauling, do open it yourself. You might solve your answer for free. If not: you know what's wrong and what you'll pay for.

If I find the time, I'll take a closer look at the Bonaldi boosters I have for an explanaition.

 

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Have you checked to make sure that there is a large amount of engine vacuum at the booster end of the vacuum hose from the engine to the booster while the engine is running?

Check any auto repair manual for a vacuum brake booster diagnosis. They are fundamentally the same.

Top Power Brake Booster Questions

If there is no vacuum at that end of the hose, the booster will act like the engine is not running. Hard pedal and very little braking without a lot of effort.

The vacuum hose comes all the way from the engine and could be collapsing in an area you cannot see while the motor is running.

My experience is that you will hear a vacuum leak if the booster diaphragm is leaking.

It is a good idea to watch a you-tube video on how a booster works or at least looks at some diagrams. They are not complicated, but do fail, but not often, especially in a car with little ambient heat near the booster.

If you have another car with a similar type brake booster, you could pull the vacuum line off of the other car at the booster while it is running, to compare the amount of vacuum at the booster.

I have taken them apart and patched the rubber diaphragm in the booster, but I really don't recommend that as a long term repair.



Good luck,
Jerry
DRG