Odd? - thoughts pls

The Oily Bits S1 Specific Topics
1

A funny thing happen on the way up to Emerald (top bloke Mr Walker BTW, beautifully mapped car). The brakes feel great (brilliant even!) following Lakeside’s SRF swap but I got stuck in traffic for about half an hour on the A12 and the car got very hot (as normal in a jam). However, the brake pedal became VERY hard, hardly moved. They still worked and came back to normal after the car cooled down a bit and I don’t know if I was imagining it but the clutch seemed to effect them. Any ideas/anything to worry about?

Ta in advance.

Ian

2

Suspect the fluid just got hot, & expanded.

Are you now able to rev all the way round to 9000rpm, like all good K series should?

3

Worth getting it checked out though. If that is happening in February what will summer be like

4

Worth getting it checked out though. If that is happening in February what will summer be like

Can’t see the problem - hard brake pedal is good, plus Ian says he was stuck in traffic for 1/2 hour. Perhaps you’ve forgotten what a proper brake pedal feels like?

5

Suspect the fluid just got hot, & expanded.

Are you now able to rev all the way round to 9000rpm, like all good K series should?

Ta

No point, the power tails off between 7-8,000. I need a charger to ram more air in there.

Ian

6

Yep, but it was half an hour in Feb. I know its darn sarf, but it ain’t that warm.

Plus my brake pedal is hard…it’s made of aluminium the same as yours Or have you swapped that for a Honda one too

7

Remote possibility but worth knowing about -

it’s possible for the brake line to have split internally leaving a piece of rubber flapping inside. This can wedge itself across the pipe and cause what you were feeling, and then it flaps itself free.

Happened to me before and took ages searching-swapping bits uselessly till we found out. It random and frustrating and naggingly scary.


Could a stone not have been jammed in the pad perhaps?

8

I could see that but it was definitely heat related.

I understand when you change the fluid the clutch is on the same circuit but you have to do something to empty out its reservoir (open a gate or something). I wondered if this hadn’t been closed if that would cause it? (am I making any sense?! )

Ian

9

Did lakeside bleed the clutch as well as the brakes Ian?

The brakes and clutch, share the same fluid reserviour and there is no valve or anything stopping fluid going between the two systems.

SRF does not mix well at all with other fluids, so if the clutch wasn’t bled at the same time as the brakes, some cross contamination may have occured. I’m not saying that this is why your pedal went hard, but it isn’t a good thing.

10

Don’t worry the Edwards put SRF in clutch too, so at the worst it’s old SRF in there.

I thought you had to do something other than just bleed brakes/drain fluid to change the clutch oil?

Ian

11

I think there’s a bleed point on the clutch master cylinder in the engine bay isn’t there ?

12

No there is just a bleed nipple on the clutch slave cylinder on top of the gearbox, and there is nothing else special that you have to do to bleed the clutch through.

13

Sorry…that’s the one I meant…