Girling Offside Rear Caliper - Which hose to where, please?

[esray]

Dear Forum,

About 2 years ago I refurbed my leaking rear calipers and because my Haynes told me to fit the piston seals with the smallest diameter uppermost I did! Unfortunately, through the good offices of this website, I subsequently discovered that a better description of the correct way up is 'looking like a ballerina's skirt'!!

I am amazed that I have got away with this error for so long, but now I find myself redoing the job correctly.

The plug for the caliper pin had seized into the offside caliper and would not turn. In the end I have had to remove the bearing case from the diff (four bolts and it's off with the caliper in tow)! The caliper boday needed a hell of a lot of heat before the plug would undo!

Before I start putting the caliper back. please would somebody check the pic below and confirm that I have the two brake pipes on the correct connections?


Thank you!

 

[colnerov]

Hi, the general rule with brake hydraulics is "out over in". As air wants to rise in the brake
fluid it helps with bleeding and avoiding trapped air. Although not critical is this instance
that is correct.

Colin

 

[esray]

Hi, the general rule with brake hydraulics is "out over in". As air wants to rise in the brake
fluid it helps with bleeding and avoiding trapped air. Although not critical is this instance
that is correct.

Colin

Thanks Colin

ATB Ray

 

[quattro]

About 2 years ago I refurbed my leaking rear calipers and because my Haynes told me to fit the piston seals with the smallest diameter uppermost I did! Unfortunately, through the good offices of this website, I subsequently discovered that a better description of the correct way up is 'looking like a ballerina's skirt'!!

I don't really see the difference, a little skirt has the smallest diameter at the top?

The hoses fit as below

 

[esray]

About 2 years ago I refurbed my leaking rear calipers and because my Haynes told me to fit the piston seals with the smallest diameter uppermost I did! Unfortunately, through the good offices of this website, I subsequently discovered that a better description of the correct way up is 'looking like a ballerina's skirt'!!

I don't really see the difference, a little skirt has the smallest diameter at the top?

The hoses fit as below

Hello Quattro,

But if you look at the seal, the smallest diameter is at the bottom - under the 'skirt'?



The brake pipes in your picture are the other way round to those on mine (your hose joining the two calipers together is under the hose supplying fluid to both?

Which is correct, please?

Best regards,

Ray

 

[quattro]

The smallest diameter is at the top, the larger diameter 'IS' the skirt. That's the way I read it

The one in the picture is correct, as the pressure from the fluid comes up under the skirt (Behave :shock: ) and forces it against the cylinder, giving the seal.

That's the way the hoses were on when I took it out of the car

It didn't seem right to me but I know the bleed nipple on the other side it at the bottom, which is also a bit daft.

Richard

 

[esray]

Hello Richard.

Thanks for your post. Logic dictates that you are correct; however, if you look closely at the pic of the seal you will notice that there is a much smaller diameter 'ring', at the bottom of the seal (under the 'skirt''). If you follow the instructions given by Haynes you would place this smaller diameter uppermost and this (as you point out) would be wrong!

Anyway, please do either you or Colin think it is important which of the brake pipes is above or below the other, or do you think it does not matter either way?

Best regards'

Ray

 

[codekiddie]

Anyway, please do either you or Colin think it is important which of the brake pipes is above or below the other, or do you think it does not matter either way?

Best regards'

Ray

Mine match Richards photo, and they went back on the way they came off when I replaced the rear calipers a while back.

I can see the logic behind the 'out' pipe being higher than the 'in' pipe, but I have never noticed any odd effects from them, so maybe it doesn't matter :?

The only picture I could find in the WM was in the brake bleeding section, and shows the bleed nipple, (an 'out' pipe), being where Richard and I have ours, which is below the 'In' pipe.

 

[colnerov]

Hi, I did say in this instance it wasn't critical. In some applications it is, like the front
calipers and some wheel cylinders where there could be more fluid and possibly more air.
The galleries in these calipers are quite small so the air will be carried through easier.
The bottoms of the union holes could dictate which ones have single or double flared
pipes or bleed nipples.

Colin

 

[Vern Klukas]

Hi, I did say in this instance it wasn't critical. In some applications it is, like the front
calipers and some wheel cylinders where there could be more fluid and possibly more air.
The galleries in these calipers are quite small so the air will be carried through easier.
The bottoms of the union holes could dictate which ones have single or double flared
pipes or bleed nipples.

Colin

There are no single flares (or double in the usual sense of the term—flared and then reflared so there is a double layer of material in the concave flare) in the braking system, only the dreaded bubble flare. So all the union holes have a concave tapered seat. Of course two of the hose ends rely on flat copper washers to seal, but the hole bottom is still tapered.

Now that I've written that, I really should go and check if that is true for the RH caliber body.

Yours
Vern

 

[colnerov]

Hi, I would think both calipers are the same because they have other applications, namely
MkIV Ford Zephyr/Zodiacs. Which were "end of the line" and not linked together.

Colin

 

[quattro]

The bleed nipple is in the lower hole because it would be impossible to bleed the brakes with it in the upper one, as 1/. It's difficult enough to get at it as it is, and 2/. there will be a pipe in the way, as the transfer pipe will be in the lower hole.

Richard