If I decided to track it tomorrow I’d be running Castrol SRF. Its done well for me in my previous track cars.
Pros: done well on track
Reviews of Castrol brake fluid
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18 votes
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6 reviews
Description
Castrol
Germany
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Get castrol SRF in there, no one should be tracking with the stock fluid. If novice 1st time maybe its fine but I would still do it, its cheap insurance
Pros: good for tracking, cheap insurance
I would argue that Castrol SRF is the best, though it's the most expensive. It has the highest wet boiling temp, which I think makes it the safest to run for the longest period of time.
Pros: highest wet boiling temp
Cons: most expensive
when comparing brake fluids, Castrol SRF is generally considered one of the only brake fluids that can changed annually (and the cheapest of those that qualify) and used through an entire track season, due to it's much higher wet boiling point
Pros: high wet boiling point
I decided to go with Castrol GT LMA. It was reasonably priced and should do the job just fine.
Pros: reasonably priced
Vehicle:
Volkswagen Passat
I've had RedBox's before on my VR6 (actually still on it right now, have to fix that!) and I've managed to make them fade with HARD street use. Albeit it was a really spirited drive through the country, but they started to go after some very high to low speed decels. I would NOT attempt to take these pads to a track day, they would vaporize. I know a few people that tried to use them with not so good results. It's a nice pad for mild street use, but you probably want something beefier. I've heard alot of good things about the EBC Green pads as well as the Hawks. I have the Hawks to go onto my Rabbit shortly, and have heard nothing but rave reviews for them. If they work out well on that, they'll make it to the VR6. As for fluid, anything DOT4 should work well, and I've never had a problem with the ATE superblue. I'm using the Castrol brakefluid in my Rabbit because my uncle (and alot of guys in Porsche club) swear by it. It's easier to find so I'm giving that a shot as well. Pedal feel is determined mostly by how well you bleed the brakes, other than a caliper change. So, it's going to be the same as now, unless you switch to a 4pot caliper.
Pros: swear by it
Cons: easier to find
Vehicle:
Volkswagen
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What we know about Castrol brake fluid
The brand is registered in Germany.
In March 2026, PartReview does not yet have a formed opinion of Castrol brake fluid. You can help by adding a review for Castrol brake fluid.
Currently there are 6 reviews and 18 votes. Average rating — 4.8 out of 5. Vote balance: 18 up, 0 down.
Users also evaluated the qualities of Castrol brake fluid:
- Pedal feel - spongy pedal or longer travel signals degraded fluid - rated positively. 4.4 points out of 5.
- Warning light - brake warning or low fluid indicator may appear - no rating yet
- Leaks - wet traces near wheels or master cylinder are visible - rated positively. 5 points out of 5.
Brake fluid Castrol in car-specific ratings
See which car brands and models owners choose Castrol brake fluid for. Below are car-specific ratings where this part is in the Top-3:
- Castrol ranked #3 for: Volkswagen Passat .