A little improvement to brakes...
02-01-2013, 01:10 PM
#17
Nice revision Carl. One ordered.
02-01-2013, 01:23 PM
#18
Rennlist Member
02-01-2013, 01:37 PM
#19
02-01-2013, 03:12 PM
#20
Rennlist Member
Close. The cap doesnt pop off, it wont let calipers fully release.
Most wont, but it will depend on how hard one drives, and how BAD the fluid is.
If you cant vent or expand elsewhere, you gain residual pressure in the system..
I dunno, Im not sure if Porsche is a racing company or not. Could be wrong.
Most wont, but it will depend on how hard one drives, and how BAD the fluid is.
If you cant vent or expand elsewhere, you gain residual pressure in the system..
I dunno, Im not sure if Porsche is a racing company or not. Could be wrong.
02-01-2013, 03:17 PM
#21
Rennlist Member
Jeff, I suspect the bellows were not widely available or used when the 928 brake fluid reservoir was designed. What does Porsche use on their new cars?
02-01-2013, 03:26 PM
#22
Are these the ones on Rockauto for $3.48 for the pair or $1.74 each?
http://www.rockauto.com/catalog/moreinfo.php?pk=14388
42081 Doorman
http://www.rockauto.com/catalog/moreinfo.php?pk=14388
42081 Doorman
02-01-2013, 04:26 PM
#23
Race Car
It is interesting that that Dorman cap is specified for vehicles all the way back to the late 1970's... one such example that may seem quite familiar to us:
CHRYSLER LEBARON (1978 - 1995)
Dan
'91 928GT S/C
475hp/460lb.ft
CHRYSLER LEBARON (1978 - 1995)
Dan
'91 928GT S/C
475hp/460lb.ft
02-01-2013, 05:11 PM
#24
Rennlist Member
Almost anyone who has done any "near serious" track driving has probably experienced some 'belching' from the hole in the master cylinder cap. It occurs when small areas of the brake fluid in the caliper exceeding the boiling point and expanding dramatically in the caliper/brake line, forcing fluid back up into the reservoir. I always cover my reservoir cap on my track car with a double covering of the blue paper/fabric type shop towel, held on snugly with a tie wrap.
Even though I purge the brake system 2X per year (spring and late summer), and use ATE Blue Racing Fluid, I still get some spotting on the towel - about the size of a quarter at the end of 2-3 days of driving (225-350 miles on the track). I might consider these bellows for the '94 street/road car, but not the '89 track car.
Gary--
Even though I purge the brake system 2X per year (spring and late summer), and use ATE Blue Racing Fluid, I still get some spotting on the towel - about the size of a quarter at the end of 2-3 days of driving (225-350 miles on the track). I might consider these bellows for the '94 street/road car, but not the '89 track car.
Gary--
02-02-2013, 01:13 PM
#27
Rennlist Member
Almost anyone who has done any "near serious" track driving has probably experienced some 'belching' from the hole in the master cylinder cap. It occurs when small areas of the brake fluid in the caliper exceeding the boiling point and expanding dramatically in the caliper/brake line, forcing fluid back up into the reservoir. I always cover my reservoir cap on my track car with a double covering of the blue paper/fabric type shop towel, held on snugly with a tie wrap.
Even though I purge the brake system 2X per year (spring and late summer), and use ATE Blue Racing Fluid, I still get some spotting on the towel - about the size of a quarter at the end of 2-3 days of driving (225-350 miles on the track). I might consider these bellows for the '94 street/road car, but not the '89 track car.
Gary--
Even though I purge the brake system 2X per year (spring and late summer), and use ATE Blue Racing Fluid, I still get some spotting on the towel - about the size of a quarter at the end of 2-3 days of driving (225-350 miles on the track). I might consider these bellows for the '94 street/road car, but not the '89 track car.
Gary--
