topping up brake fluid
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Joined: Jan 2017
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From: fraser valley
topping up brake fluid
Noticed that the brake fluid was low in the resevoir of my 1973 xj6. the label says to use girling or castrol . the fluid is a green color. what should i use to top up?
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Sep 7, 2020, 05:13 PM
Joined: Dec 2009
Posts: 13,636
Likes: 9,573
From: Wise County,TX
I always hated it when people would top up the fluid as routine maintenance because the reservoir volume is calculated to be LOW when the brake pads were worn enough to allow the caliper pistons to have enough fluid displaced to cause the level indicator to illuminate.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
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Joined: Apr 2020
Posts: 66
Likes: 37
Green? That's not good... Either your car has very very old Castrol-Girling Green fluid—which I think would have been the factory-recommended fluid in '73—or the fluid is so old contaminants have turned it green.
To be safe I would flush the system entirely with new fluid, rather than top it up. Castrol-Girling Green was replaced by their Amber fluid in the late 1970s, a.k.a. Castrol-Girling "Universal" fluid; the Universal fluid is what's spec'ed in my '88 Series III. The modern equivalent is Castrol DOT4, but really any DOT4 fluid should do.
To be safe I would flush the system entirely with new fluid, rather than top it up. Castrol-Girling Green was replaced by their Amber fluid in the late 1970s, a.k.a. Castrol-Girling "Universal" fluid; the Universal fluid is what's spec'ed in my '88 Series III. The modern equivalent is Castrol DOT4, but really any DOT4 fluid should do.
Joined: Dec 2009
Posts: 13,636
Likes: 9,573
From: Wise County,TX
I always hated it when people would top up the fluid as routine maintenance because the reservoir volume is calculated to be LOW when the brake pads were worn enough to allow the caliper pistons to have enough fluid displaced to cause the level indicator to illuminate.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
Senior Member
Joined: Jun 2014
Posts: 414
Likes: 160
From: Australian Capital Territory
I prefer to use the BLUE coloured Dot 4 fluid. Reason? Easier to see the fluid level in the (aged) yellowed plastic master cylinder reservoir !!!
My two shillings worth.
Pete
My two shillings worth.
Pete
I always hated it when people would top up the fluid as routine maintenance because the reservoir volume is calculated to be LOW when the brake pads were worn enough to allow the caliper pistons to have enough fluid displaced to cause the level indicator to illuminate.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
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Joined: May 2023
Posts: 24
Likes: 0
I always hated it when people would top up the fluid as routine maintenance from the car garage mussafah abu dhabi because the reservoir volume is calculated to be LOW when the brake pads were worn enough to allow the caliper pistons to have enough fluid displaced to cause the level indicator to illuminate.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
If there is NO LEAK and the level indicator comes ON, then a brake pad change is required!!!!
I'm sure the engineers spent time to calculate this and NOBODY uses this logic.
Even when I replace the fluid in the system I try to put the level at the same point before I drained/flushed/replaced the fluid. (recommended every 2 years)
Just me thinking out loud.
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