LM841 double brakes problem

[Uusitalo]

Hi!

I have this old 1973 year volvo bm lm 841 with "duppelbroms" can i get somewhere master cylinder repair set for this type rare brake system? My dad repaired it about 20 years ago but now seals are broken again.
Got spare machine same year with working cylinder but i dont know if it last long so im trying fix this broken one first. 2" inch side is leaking fluid and outer rubber seal cushion is broken but no rust inside piston/cylinder.
Original is Ate Lockheed.


And what is best way convert this double brake system only using one slave cylinder per side? Plugging other slave cylinder pipe or how? ...its too pricey fix both for me.
Also repairing rusty floorpanels same time.


You can answer Swedish or English.

[Michael Meier]

https://www.olssonparts.com/se/sv/reser ... /BM-276590

[Michael Meier]

if you only use 1/2 of the fluid to make a complete movement of the slave cylinder, install a brand new master brake cylinder with 1" bore.

[Uusitalo]

That olssonns wont sell reppair kit for my master cylinder..alreadyt ordered this: https://www.olssonparts.com/se/sv/reser ... /BM-276590 but now i need return it back. wont fit..

New cylinder sold by olsson,batrading etc is little bit too overpriced 500€: https://batrading.se/sv/Huvudmeny/Bakla ... ?id=230858

Im getting one from other vehicle maybe, fitting looks easy to make:
https://www.olssonparts.com/com/en/spar ... 0324/50324

https://www.amazon.com/Dorman-M1050-Bra ... RFOY&psc=1
Anyone have exprience using other vehicles brake cylinders? pretty much same bore and similar contruction.

[Michael Meier]

You use brakefluid ?

or ordenary engineoil/hydraulic fluid?

If brakefluid, you can use from other vehicles, its not the same amount of money.

[Uusitalo]

Luckily i found full 2" repair set from Finland (lassas ab) 115€ vat zero. I think they got NOS parts.

Of course using brakefluid dot 4 but i need really look what is best solution repair these kind old machines...these brake parts are pretty much manufactured by other companies and price scale is pretty big.
They ask about 150€/pc for this slave brake cylinder: https://www.olssonparts.com/se/sv/reser ... /BM-784924
Its Girling made and you can get these new ones around 15-30€/pc if you search little bit and my machine need four of them. Still plenty to do but hoping get some brakes after 20year..