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| confirmation required of my braking problem diagnosis... https://forums.tipec.net/viewtopic.php?f=25&t=9411 |
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| Author: | doctor924 [ Tue Sep 07, 2010 7:44 am ] |
| Post subject: | confirmation required of my braking problem diagnosis... |
HI In driving my 944 this morning, about a mile or so into the journey I noticed the brake pedal suddenly had alot more travel than previously and felt much more spongey. Car still pulled up OK but a bit unnerving when you have to go for a second push on the brake pedal as it has travelled a long way down. When sat in the car, engine running I can depress the brake pedal almost to the floor (albeit slowly) I checked the brake reservoir - no fluid loss which combined with the longer brake pedal travel and its feel suggests to me I have a failed/failing brake master cylinder. Anyone concur or offer another reason? Cheers IAn |
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| Author: | tr7v8 [ Tue Sep 07, 2010 8:53 am ] |
| Post subject: | Re: confirmation required of my braking problem diagnosis... |
Would be my guess as well. When was the brake fluid last replaced? |
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| Author: | doctor924 [ Tue Sep 07, 2010 10:09 am ] |
| Post subject: | Re: confirmation required of my braking problem diagnosis... |
Thanks Jim Fluid less than 4 months old - BUT car had been stood for 5 years with the same fluid prior to my renovation of it. Perhaps this is not surprising then, given I had to replace both clutch master and slave - because of the same problem Cheers Ian |
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| Author: | tr7v8 [ Tue Sep 07, 2010 10:47 am ] |
| Post subject: | Re: confirmation required of my braking problem diagnosis... |
doctor924 wrote: Thanks Jim Fluid less than 4 months old - BUT car had been stood for 5 years with the same fluid prior to my renovation of it. Perhaps this is not surprising then, given I had to replace both clutch master and slave - because of the same problem Cheers Ian Yup old fluid very often a cause. When you replaced it did you syphon most of it out of the reservoir or pump it through? Also you should never use full strokes when bleeding as it forces the rubbers on to new possibly rough bits of m/cyl. |
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| Author: | doctor924 [ Tue Sep 07, 2010 11:06 am ] |
| Post subject: | Re: confirmation required of my braking problem diagnosis... |
Pumped it through, as all brake lines done at same time. Just sounds/feels like the seal is failing |
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| Author: | doctor924 [ Fri Sep 10, 2010 1:12 pm ] |
| Post subject: | Re: confirmation required of my braking problem diagnosis... |
HI All Just to round off this thread - I changed the brake master cylinder yesterday and have regained my firm -non sinking - brake pedal. Also gave me chance to check the brake hoses/lines for corrosion and all happily fine. Looking forward to using the car again and to testing the 9tuning chip I installed at the same time. Cheers Ian |
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| Author: | tr7v8 [ Fri Sep 10, 2010 1:48 pm ] |
| Post subject: | Re: confirmation required of my braking problem diagnosis... |
doctor924 wrote: HI All Just to round off this thread - I changed the brake master cylinder yesterday and have regained my firm -non sinking - brake pedal. Also gave me chance to check the brake hoses/lines for corrosion and all happily fine. Looking forward to using the car again and to testing the 9tuning chip I installed at the same time. Cheers Ian Good to hear it, maybe a lesson learned that when you change brake fluid you syphon as much out of the master as possible. Saves flushing the junk through the seals. |
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| Author: | doctor924 [ Fri Sep 10, 2010 2:36 pm ] |
| Post subject: | Re: confirmation required of my braking problem diagnosis... |
I think its more a case of appreciating that seals dry out and suffer - as the master cylinder/reservoir was empty of fluid when I got the car. Perhaps inevitable that a car standing so long will suffer these issues especially as it gets more and more use. |
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