Dear All,

Brake booster assembly on my UNO45 FIRE needs to be repalced as there was leak in the booster assembly.

Booster assembly that was originally fitted on my vehicle is of Bosch make and presently these units are not availble at FIAT dealer or in the local market as a spare part.

As the Bosch units are not avialble (in India) at present, i have to install TVS make brake booster assembly (with master cylinder) with some alterations on the pipelines .

Is the process explained by mechanic is true?

Will I get originality in the brake system, if I install TVS brake booster with alterations?

Any Idea, where I can get Bosch brake booster system in india.?

Please help

Anil

Sorry - I don't have any ideas - but I don't think a different booster would be a problem. By 'modifications to the pipelines' I assume you mean just a slight repositioning of the master cylinder, since the servo should be independant of the hydraulics - it just pushes on the master cylinder?

There were some servos (for Minis, as I recall) that worked in the hydraulic system (mounted remotely from the master cylinder) - I wouldn't use one of these with the Uno, though I guess there's no reason why not to - but attaching the pedal to the master cylinder could be tricky. Some early Uno 45s did not have a servo at all, incidentally.

Fitting a different servo would technically be illegal here in NZ. In practice I know of a couple of cases where the Punto servo is used because it's smaller/master cylinder is shorter.

I've never seen a 'Bosch' servo on an Uno, it's probably a local-assembly part? I'd just go along with the dealer's suggestion.

-Alex

I'm almost sure that the Servo's from the Punto Mk1, (base models) are the same as those found in the Uno (base models).

I haven't to hand the Fiat parts CD, but if someone (Alex?) can check this, then that will be your answer.

Alex is right the very early 45's came with no servo I had a Fiat 127 1050cl with no servo as standard, and that was "brown pants time" every time I came to a halt....

alexGS said:

Sorry - I don't have any ideas - but I don't think a different booster would be a problem. By 'modifications to the pipelines' I assume you mean just a slight repositioning of the master cylinder, since the servo should be independant of the hydraulics - it just pushes on the master cylinder?

There were some servos (for Minis, as I recall) that worked in the hydraulic system (mounted remotely from the master cylinder) - I wouldn't use one of these with the Uno, though I guess there's no reason why not to - but attaching the pedal to the master cylinder could be tricky. Some early Uno 45s did not have a servo at all, incidentally.

Fitting a different servo would technically be illegal here in NZ. In practice I know of a couple of cases where the Punto servo is used because it's smaller/master cylinder is shorter.

I've never seen a 'Bosch' servo on an Uno, it's probably a local-assembly part? I'd just go along with the dealer's suggestion.

-Alex

Click to expand...

Finally it turns out that (When I take out the Servo) it's of Bendix make.

These units are not availble in india. I have tried for other replacements-No success.

Please can any one advice, where I can get this unit in india.?

Also if any on line shop available to purchase this part and can deliver this product in india. Please help.


Rajeev, Do you have an Idea? Are these units available at Bombay?

Thanks
Anil

Just my two cents worth - the brake servo is not a common failure. I believe that it's safe to trust one from a wrecked car as it would be unlikely to be damaged in a collision due to its sheltered location. You may find that similar FIATs have the same servo (I don't know if you have the Mk1 Punto in India, and sadly I don't have a parts book etc. to check compatibility). I hope Rajeev can help with more specific information/suppliers. Perhaps try a personal message (PM) from the User CP since it's sometimes easy to miss forum messages accidentally

Remember that your braking system is still functional without the servo, but you require a very hard push on the pedal (so, not pleasant to drive).

The test for the servo, which you probably know, is to pump the pedal at least ten times with the engine switched off, then hold the pedal down and start the engine. You should feel the pedal fall away as the servo assists once the engine is running. With the engine switched off, there should be enough residual vacuum for at least three pedal pumps.

-Alex

You know, looking at this, makes me wonder whether this problem is less servo related and more seized calipers related.

On the Uno 60's the pedal feel was quite hard, with not much in the way of braking. During the replacement of the pads and discs, I also checked the Calipers, both were partially seized, due to the rubber ring being perished. I stripped down the Caliper, thoroughly cleaned it all up, and replaced the rubber ring, and the pedal pressure now feels much more inkeeping with the amount of braking I'm getting.

Perhaps, the servo is working well here, but the Calipers are so stiff all the energy is being absorbed in moving the Caliper piston, rather than clamping the pads on the discs?

Like you, Alex, I've rarely heard of servo problems, usually it will just not work at all rather than continue on not working well...