1" master cylinder rebuild kit alternative
- Thread starter Dana67Dart
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Mecki
Well-Known Member
I finally ordered the kit for a Toyota HiAce 87-06 to see if the residual valves included in the kit would fit.
The diameter is the same (app. 9mm) as the Mopar valve (right) but it's shorter. The top side looks the same and with the spring inside should seal against the bottom of the brass insert. The kit includes 2 valves for drum brake (1 needed) and one recessed valve for disk brake (not needed, Mopar uses no valve).
The 2 seals in the kit that are 3/16" thick and have ID 15,0mm could be used to replace the original 2 seals with ID 7/16", by making 2 collars 11,0mm x 15,5mm x 5,0mm out of alumina or brass and pressing them tight on the pistons (orange parts in the drawing).
Here's the parts from 2 repair kits:
3 seals from ATE WV LT 75-96 (Frenkit 125044) already installed on the pistons.
2 seals and residual valve from TOYOTA HIACE 87-06 (Frenkit 125019)
The collars are not in place yet. Have to see if I can find some suitable tube material. The 2 original seals with ID 7/16" could be replaced with any OD 1" and 3/16" thick seals I already have just by making the collars fit the actual ID of the seals used.
I think the best would be to make collars with OD 15,1 and use same seals in all 5 positions. The ATE WV LT kit for $10 has four seals with ID 14,5mm. Often some of the used seals that have been in a position with no pitting are good and can be reused. So then it would be to find a single good residual valve if the one in place is bad. I have experienced that reusing old quality rubber parts (if not worn out) is often a much better choice than using new China rubber (plastic) parts.
The diameter is the same (app. 9mm) as the Mopar valve (right) but it's shorter. The top side looks the same and with the spring inside should seal against the bottom of the brass insert. The kit includes 2 valves for drum brake (1 needed) and one recessed valve for disk brake (not needed, Mopar uses no valve).
The 2 seals in the kit that are 3/16" thick and have ID 15,0mm could be used to replace the original 2 seals with ID 7/16", by making 2 collars 11,0mm x 15,5mm x 5,0mm out of alumina or brass and pressing them tight on the pistons (orange parts in the drawing).
Here's the parts from 2 repair kits:
3 seals from ATE WV LT 75-96 (Frenkit 125044) already installed on the pistons.
2 seals and residual valve from TOYOTA HIACE 87-06 (Frenkit 125019)
The collars are not in place yet. Have to see if I can find some suitable tube material. The 2 original seals with ID 7/16" could be replaced with any OD 1" and 3/16" thick seals I already have just by making the collars fit the actual ID of the seals used.
I think the best would be to make collars with OD 15,1 and use same seals in all 5 positions. The ATE WV LT kit for $10 has four seals with ID 14,5mm. Often some of the used seals that have been in a position with no pitting are good and can be reused. So then it would be to find a single good residual valve if the one in place is bad. I have experienced that reusing old quality rubber parts (if not worn out) is often a much better choice than using new China rubber (plastic) parts.
Last edited:
scatpackbee
Well-Known Member
Us disk brake owners appreciate the hard work you’re putting into this.
Thank you!
scatpackbee
Well-Known Member
I contacted a “local” rebuilder to me and they told me they have the seals for the 1” diameter disk brake master (I provided the master cylinder application to them), but will not sell me just the seals, only a full rebuild for $175 in which they match up the old seals with their new bulk stock.
They question now is where do they buy their bulk stock from???
They question now is where do they buy their bulk stock from???
Mecki
Well-Known Member
CHINA.
Search: "Custom EDPM Brake Cylinder Piston Cup Seal" on alibaba.com and made-in-china.com
Some manufacturers accepts orders for only 100 pieces and there are only two sizes in the master cylinder. 3pcs of 1"x 19/32"x 3/16" and 2pcs of 1"x 7/16"x 3/16". About $50 for 200 seals. You could repair 33 master cylinders.
Mecki
Well-Known Member
scatpackbee
Well-Known Member
I’d be interested in going in with some other members on a few sets if anyone else is interested too…
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