Datsun Roadster Forum-311s.org

For decades I used Castrol GTLMA brake fluid, then they discontinued it. Castrol then came out with Brake Fluid DOT4 as a replacement. Great! Today I was talking to Castrol & found that due to supply problems they have discontinued Brake Fluid DOT4 & there is no direct replacement. They are recommending REACT SRF racing BRAKE FLUID, but it requires a flush.

Does anyone have a recommendation on where I should go from here? I’m in the middle of filling the brakes during my restoration, so I’m tempted to see if I can find enough Brake Fluid DOT4 then wait to see what Castrol comes up with before my next brake fluid change.

Peace,
Pat

The light 311 only really needs dot 3
Dot 4 was engineered for heavy vehicles , think a 4x4 truck in Texas in July .they drive 80
New fluid is harsher on seals our dealer quit flushing brake fluid after a rash of pedals going to the floor after changing fluid
( techs can and are sued over work they do )

The light 311 only

Pat. Not sure if I understand. Are you saying Castrol DOT 4 is the only DOT 4 you can use? I would think that any manufacturer’s DOT 4 would work just as well

Kai, No, I just have been using the LMA & Brake Fluid DOT4 because they have very low water absorption. There were tests done long ago that showed that GTLMA didn't absorb nearly as much water as other brands. Since most of our cars don't get driven all that much & the brake parts are not cheap, I chose to go with this line. Any DOT3 or DOT4 will work, hence my question of what brake fluid folks are using (Brake Fluid Selection wasn't the best subject, sorry.)

Peace,
Pat

Interesting … I did not know that. Thanks for explaining it.