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Turbo soggy brakes - post fluid cx

Monty2

Monty2

New member
Hi, a mini survey that could make it to the warranty post,
I had my 997 TT 2nd year service and brake fluid change carried out 2 weeks ago (9,900 miles), nothing wrong with the service experience but what have they done with my brakes?
Out on a R4 drive last weekend my brakes didn't feel right but didn't have the opportunity to stretch the engine/brakes until today and nearly T boned a poor chap in his astra on one of those annoying who goes first mini roundabouts as brakes not coming in until half way down the pedal travel. Also the brake system seems to have lost the pre fill effect when you throttle off from speed and then hit the brakes hard, previously it seemed to have the brakes work twice as fast. On hard braking I now also have the steering duck left then right then straight ahead coming to a stop.
Has anyone had similar experiences post the 2 year brake fluid change or due to other brake component issues.
Cambridge OPC usually spot on with any work they carry out on my Porsches but will have to call in for rework on this issue I'm afraid can't be having a Turbo that doesn't stop.

A few thoughts
Does anyone actually know how they change the fluid in the brake system is it old fashioned pump the brake and bleed or do they have an automatic bleed machine.
Would the brake fluid put in the system at the OPC be the same specification as factory fill.
Does an abs valve have to be opened to allow bleeding and could same valve be left open/disconnected without a dash warning illuminating.
Does the cars brain have to be reset after work on the brakes.
Any ideas appreciated and I'll feed back how I got on after speaking to Cambridge on Monday.

Paul
 
I've had mine done Paul and the brakes were a better 'feel' if anything after the service.

garyw
 
Paul,

It sounds like you might have air in the system. Does the pedal feel spoungy and keeps on going almost to the floor?

Changing brake fluid is not rocket science and I'm very surprised your OPC didn't notice the problem on road test.

I'd get back there PDQ and give 'em a piece etc. [:eek:]

Regards,

Clive
 
The fluid is changed by pressurising the system at the reservoir. Very unlikely to to get air in unless performed incorrectly.
 
ORIGINAL: Geoff997
The fluid is changed by pressurising the system at the reservoir. Very unlikely to to get air in unless performed incorrectly.
Click to expand...

Hi Geoff,

Air can enter the system by not keeing the reservoir topped up or leakage back from the bleed valve. Either way its human error and can happen irrespective of the bleeding method. [8|]

Otherwise it's a problem with the hydraulic pre-load system, resulting in long pedal travel.

Personally it's not a system I particularly like - but it seems to be favoured by an increasing number of manufacturers nowadays.

Anyway, Paul, please let us know the outcome in due course.

Regards,

Clive
 
Exactly like that Clive, a constant medium pressure does see the pedal to the floor. Its the loss of the pre brake load which is most noticeable when its not there. My audi A6 has it and the braking is superb.
I had a Range Rover and after a brake fluid cx with the pressure bleeding system it required the master cylinder to be replaced.
Paul

Paul,

It sounds like you might have air in the system. Does the pedal feel spoungy and keeps on going almost to the floor?

Changing brake fluid is not rocket science and I'm very surprised your OPC didn't notice the problem on road test.

I'd get back there PDQ and give 'em a piece etc. [:eek:]

Regards,

Clive
[/quote]
 
Paul,
In that case it's almost certainly air in the system. Even a tiny bubble will compress sufficiently for the pedal to hit the floor.

I'd get the OPC to recover it for a further investigation.

I would be inclined NOT to drive it in its current condition.

Good luck.

Regards,

Clive
 
Good words Clive, in for rework on Friday, but it will mean more conversations about GT3s while I'm waiting to be sorted.....

Paul
 
Paul,

My GT2 with PCCB's didn't have the pre-load system - for which I was extremely grateful! [:)]

Not sure about the Gen2 GT3 though.

Anyway, I'd be interested to hear how you get on.

Regards,

Clive
 
Hi Paul, I had the 2 year service and brake fluid change done on my 997TT in Aug and the brake feel didn't change at all. My mileage is very similar to yours. I would be very concerned about the steering wheel 'kickback'/differential L/R braking when braking hard, so you are right to get the OPC to take another look- it certainly sounds like you may have some air in the system.

Overall, I like the 997TT brakes - to me they are more 'positive' than on the 996TT/4S and I never have any loss of confidence that if I have to hit them hard that they won't do the job. I normally drive in 'normal' mode rather than in 'sport' and my understanding is that PSM will step in immediately if required where at least one front wheel requires ABS assistance. (In 'sport' mode, PSM will only respond when ABS is active on both front wheels).

FYI my OPC (Nottingham) also looked at my turbo bolts at the 2 year service, as they said there was a recall about these.

Pse let us know how you get on.

Regards, Andy L-T

PS I live near Sleaford if you need a 2nd opinion
 
Closure
Turbo has been into Cambs today for soggy brakes, although re-bleeding didn't show up any air in system they now feel good again with the pre-load from rapid throttle off being instantly apparent. So no clear answer to the earlier soft brakes but hats off to Cambs opc for sorting.
There was a plus side to having to go back to the dealership, have been offered a test drive plus at Silverstone centre in one of the new 997 Gen 2 models soon to appear in the UK. Thanks all for suggestions and feedback.

Paul
 
Hi Paul,

Good to hear it's now sorted. [:)]

I'm not sure OPC Cambridge fully deserve your plaudits, since it was they that sent the vehicle out with spongy brakes in the first place!

Also, whether or not it showed up (?) there clearly was air in the braking system as proved by a re-bleed resolving the problem.

I'd be inclined to speak to your Dealer Principal and voice your concerns about Service returning your vehicle to you in an unroadworthy condition.

It's a serious matter.

Regards,

Clive
 
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