Brake fluid loss

BrianMac123

BrianMac123

Active Member
#22
#22
Well can't say I wasn't warned but check this out...
Missus was taking the Toyota to the car-wash today, oh that's handy hang on a minute, I quickly deflated my spare. Ask the guy to inflate that to 10 psi, recommended by Gunson. Remember 10 psi. Five times I told her!! Off she goes, I got everything set out. Back she comes, I grabs the wheel and attaches it to the bottle. A vertical jet of Dot 4 from the master cylinder. What the...? Quickly disconnect the valve. Must have been about 30psi in the tyre, I never checked. Did you ask the guy to put 10 psi in it? Yes, told him what you were doing. Argh!
But as it happens, probably for the best as it turns out. There must be a microscopic hole on the master cylinder. I always wondered why the top was always wet, despite new cap and wiped off constantly.
 
jp928

jp928

Well-Known Member
#23
#23
Master cyl caps will ALWAYS have a small hole in them so that air can get in to replace fluid used up as brake pads wear.....
 
BrianMac123

BrianMac123

Active Member
#26
#26
jp928 said:
Oh, OK.
Click to expand...
No worries, I rebuilt it last year, but the hose to the slave is jammed in there good and won't move. So to replace meant buying the master cylinder and the hose. And I had a lot to get at that time. Both in me basket at Geoff's now.

Ever hear of the Ship of Theseus or Theseus's Paradox?
 
H

harveyp6

Well-Known Member
#28
#28
jp928 said:
Master cyl caps will ALWAYS have a small hole in them so that air can get in to replace fluid used up as brake pads wear.....
Click to expand...
Not all. A lot of yanks have a solid cap with a membrane underneath, which seals the cap and moves downwards as the fluid level drops. This also has the added benefit of sealing the system keeping moisture out.
 
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