bmw art car
Well-Known Member
i have to use on my 69 2800cs?
or is the dot 3 ok?
or is the dot 3 ok?
is there a certain brake fluid
- Thread starter bmw art car
- Start date
x_atlas0
Well-Known Member
I'm running ATE SuperBlue in mine, which is I think a DOT 4 fluid, so it should work fine with regular brake fluid.
bmw art car
Well-Known Member
why i am asking is
i replaced the master cylinder and slave cylinder.
i replaced the fluid with 3 dot . it was ok for a few days
a bit of a weak pedal
and then suddenly there was no more brake pressure
if i pump the pedal goes straight to the floor
only when i turn off the car there is a tiny bit of pressure
that quickly dissipates
is this something serious?
maybe i messed up the seals in the master? i don't know how...
but who knows
x_atlas0
Well-Known Member
why i am asking is
i replaced the master cylinder and slave cylinder.
i replaced the fluid with 3 dot . it was ok for a few days
a bit of a weak pedal
and then suddenly there was no more brake pressure
if i pump the pedal goes straight to the floor
only when i turn off the car there is a tiny bit of pressure
that quickly dissipates
is this something serious?
maybe i messed up the seals in the master? i don't know how...
but who knows
Have you lost a lot of brake fluid?
bmw art car
Well-Known Member
not really...
Brake Fluid and seals
In the past brake seals were made of rubber and DOT 3 was specified. HOWEVER, European cars had a different formula than American brake fluid. The only fluid I know of as safe is Castrol LMA that's readily available around the corner. DOT 3 or 4 ( higher boiling point).
Many unsuspecting owners dumped in the generic fluid and seals blew.
Sometime more recently seals changed to synthetic.
AND since the DOT approvals started, supposedly the formulas are compatible with foriegn cars.
Could be you need to rebleed, if you didn't bench bleed the master. You normally don't get enough stroke otherwise to clear out the last chamber.
In the past brake seals were made of rubber and DOT 3 was specified. HOWEVER, European cars had a different formula than American brake fluid. The only fluid I know of as safe is Castrol LMA that's readily available around the corner. DOT 3 or 4 ( higher boiling point).
Many unsuspecting owners dumped in the generic fluid and seals blew.
Sometime more recently seals changed to synthetic.
AND since the DOT approvals started, supposedly the formulas are compatible with foriegn cars.
Could be you need to rebleed, if you didn't bench bleed the master. You normally don't get enough stroke otherwise to clear out the last chamber.
bmw art car
Well-Known Member
that sounded very optimistic.
i'll get a power bleeder. maybe that will take care of my situation
thank you
m_thompson
Well-Known Member
I have used Castrol LMA in my BMWs for decades. I also use a pressure bleeder to replace it every few years.