Brake Master buckets

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17 May 2013 07:44 #1 by TH
TH created the topic: Brake Master buckets
Has anyone stripped the brake master to replace the buckets? Can only find mention of replacing the entire master on here. Or are they that odd a size that it is impossible to find a suitable replacement?


I see complete master cylinders on eBay and have grabbed one just in case.

Cheers, Tony

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17 May 2013 17:21 #2 by Peter334
Peter334 replied the topic: Brake Master buckets
TH ,I am in the middle of mine and I also thought it was repairable but no, there are some odd things in side so I just brought one from Paul Knott $240 approx. new .cheers peter

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17 May 2013 17:31 #3 by TH
TH replied the topic: Brake Master buckets
Thanks Peter.

They look deceptively simple from the outside. Will have a look inside when I get a replacement.

Cheers, Tony

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21 May 2013 06:14 #4 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Brake Master buckets
They look to be a "standard" GM master cylinder as is the Hydroboost unit. Very common on US made vehicles of Oka vintage (1990's) especially diesel powered as there is no need for a vacuum pump for brake assistance.
Visiting a brake place with the bits in hand should turn up some replacements.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 680w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.
The following user(s) said Thank You: TH

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21 May 2013 07:33 #5 by TH
TH replied the topic: Brake Master buckets

Cheers, Tony

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21 May 2013 12:00 - 21 May 2013 12:02 #6 by Outback Jack
Outback Jack replied the topic: Brake Master buckets
I think the Hyrdobooster is off same as well.
Last Edit: 21 May 2013 12:02 by Outback Jack.

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21 May 2013 17:30 #7 by Peter334
Peter334 replied the topic: Brake Master buckets
If the master cyclinder has been on a long time as mine has, its not until you pull it to pieces replace all the parts put it back together and it still is no good, and it leaks, then to find out the cyclinder is oval so make sure you check it out. cheers peter

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21 May 2013 19:25 #8 by Joseph Baz
Joseph Baz replied the topic: Brake Master buckets
TH,the original master cyl is more like a hydraulic ram,it doesn't have buckets like conventional master cylinders buy "O" rings with nylon washers behind them,for the price of the new ones it's not worth the efford specially if scoring lines are visible.
Cheers,Joe

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21 May 2013 19:29 #9 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Brake Master buckets
The other problem is that when bleeding the brakes people allow the pedal and in turn the internals to travel further than they normally do. The section of the master cylinder bore past the normal operating range is usually corroded or covered in crud which in turn wrecks the rubbers and then results in brake problems.
Easy solution is to make a chock to prevent the pedal going past its normal travel on the floor, it takes longer to bleed but stops the master cylinder rubbers from being wrecked.

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 680w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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21 May 2013 19:38 #10 by Joseph Baz
Joseph Baz replied the topic: Brake Master buckets
Good point Pete!!
Cheers,Joe

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21 May 2013 20:12 #11 by TH
TH replied the topic: Brake Master buckets
I haven't found any reference to rebuilding them online yet, plenty of replacements now I know what to look for.

I'm guessing the brake fluid has never been changed.

I take it that everyone uses a dot 3 fluid? Dot 4 may not be compatible?

Cheers, Tony

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22 May 2013 17:51 #12 by Peter334
Peter334 replied the topic: Brake Master buckets
Myself I have used dot 4 high temp as she is heavy and they do get hot ,cheers peter

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22 May 2013 18:07 #13 by Peter334
Peter334 replied the topic: Brake Master buckets
I just googled the difference of dot3 and dot4 and it is the temp range and 4 dosnt let water to absorb into it as easy, and as we know when brakes get hot they fade so dot 4 will hang in longer , cheers peter

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22 May 2013 18:51 #14 by TH
TH replied the topic: Brake Master buckets
Might be a Toyota thing but I have always been told if you put dot 4 in a 'cruiser it will wreck everything. Probably the moisture control that's the key.

Found the operators manual so will check that

Cheers

Cheers, Tony

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22 May 2013 19:20 #15 by Joseph Baz
Joseph Baz replied the topic: Brake Master buckets
For those who are doing brakes this link may be interesting www.speedbleeder.com
Cheers,Joe

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23 May 2013 05:15 #16 by PeteFox
PeteFox replied the topic: Brake Master buckets

Joseph Baz wrote: For those who are doing brakes this link may be interesting www.speedbleeder.com
Cheers,Joe


Looks good Joe, does anyone know what the thread is in the Oka bleed screws?

Pete Fox OKA266 MultiCab
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23 May 2013 06:49 #17 by Peter and Sandra OKA 374
Peter and Sandra OKA 374 replied the topic: Brake Master buckets
Peter
My thoughts exactly, come on Joe we would like the rest of the info ;-))))

OKA 374 LT Van, converted to camper/motorhome,
400ah Lithiums, 680w solar, diesel cooking heating and HWS,
Cummins 6BT, Allison 6 speed auto, Nissan transfer.

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23 May 2013 08:16 - 23 May 2013 08:32 #18 by PeteFox
PeteFox replied the topic: Brake Master buckets
I pulled a bleeder from the spare diff I have.
I can confirm that the thread is M10 x 1.5 as a bolt screwed straight in.
The Speedbleeder listing shows that Part No SB1015 fits Chevvy 3500's etc from the 90's which agrees with other common parts such as the Hydroboost, master cylinder etc is from the same Chev vehicles.
This should fit the Oka





The Oka one, only appears different in the length of the nipple.

I have ordered an additional four sets of these because I figured somebody would want them. I am combining these with some other US freight so the cost would be negligible. Available at my cost plus Aus postage. email or PM me.

Pete Fox OKA266 MultiCab
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Last Edit: 23 May 2013 08:32 by PeteFox.

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23 May 2013 16:16 - 23 May 2013 16:30 #19 by dandjcr
dandjcr replied the topic: Brake Master buckets
Pete that's useful info.

However, one of my rear callipers is stamped Bendix 2238451-L. I did a search on this and came up with this Haldex site which shows that casting number to have a 3/8-24 inlet port thread. There are other similar sized callipers lower down (for Chevy's) with M10x15 threads which are a very similar size. Are the inlet ports and bleed ports likely to be different threads, a mix of imperial and metric? Or am I on the wrong track?





I just threw this in case some callipers have different casting numbers on them.


David and Janet Ribbans - Oka 148
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Last Edit: 23 May 2013 16:30 by dandjcr.

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23 May 2013 16:51 - 24 May 2013 07:04 #20 by PeteFox
PeteFox replied the topic: Brake Master buckets

dandjcr wrote: Pete that's useful info.

However, one of my rear callipers is stamped Bendix 2238451-L. I did a search on this and came up with this Haldex site which shows that casting number to have a 3/8-24 inlet port thread. There are other similar sized callipers lower down (for Chevy's) with M10x15 threads which are a very similar size. Are the inlet ports and bleed ports likely to be different threads, a mix of imperial and metric? Or am I on the wrong track?


Dave
I had to cleanup the inlet thread on on of my callipers I think I used a 3/8" UNF tap, which is 3/8 - 24 tpi.
The M10 thread on the bleed screws is 1.5mm pitch which is nearer to 17tpi. You wouldn't mistake the two. 3/8" UNC is 16 tpi.
The metric bolt will not screw into the UNC and vice versa.

Pete Fox OKA266 MultiCab
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www.byles.net/www.oka4wd.com/forum/membe...oka-266?limitstart=0
Last Edit: 24 May 2013 07:04 by PeteFox.

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