I am about to replace (again) brake master cylinder on my '88
Audi 100 2.3E Avant. When I replaced brake fluid last time I used
Castrol DOT 5.1.
I can not find that oil here any more, so can I use DOT 4 to top up
what is spilled during brake master cylinder replacement?
I plan to change brake fluid again soon when I change rear calipers and
all fur disks. But master cylinder has to be replaced now.
BTW any ideas what cause might pistons in master cylinder not to
retract fully when the engine is fully warmed up? This is second time
this has happened in 3-4 years. I also had clutch master cylinder
failure some 5 years ago (but the opposite way, I press and hold the
clutch and it would slowly engage).
I guess it might be the wrong brake fluid, I guess that DOT 4 is more
than enough, which is the correct one?
- posted 11 years ago