Author Topic: 1970 280SL Brake master cylinder swap question  (Read 1880 times)

h100vw

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1970 280SL Brake master cylinder swap question
« on: February 25, 2022, 06:04:58 »
Hi Chaps, I have the task of swapping the master cylinder out for a friend. The new one has 2 rubber inserts to take the reservoir. However, the original, I am guessing, doesn't.

Of course it's friday and I cant get the supplier of the new MC and ask what's happening.

Have we got the wrong part?

Pics attached for the original.

The replacement is ATE 03.2123-1003.3

Thanks in advance for any ideas or advice

Gavin


h100vw

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Re: 1970 280SL Brake master cylinder swap question
« Reply #1 on: February 25, 2022, 06:16:49 »
Ok, so I am that guy.....

I have never been around the back of this car until just now... It's a 230, so that is going to explain a lot isn't it :D

Easier/cheaper to fit the 280 reservoir or beg the parts people to swap the MC?

Benz Dr.

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Re: 1970 280SL Brake master cylinder swap question
« Reply #2 on: February 25, 2022, 07:24:48 »
Not exactly the right answer, but I have all of the original booster and MC on my 230SL. I put a disc brake rear axle in my car a number of years ago and it has excellent brakes. My point is that you can apparently mix and match certain parts in the system if you know what to do.
The 230 MC has a check valve on it for the rear brake line. It maintains a bit of residual pressure so that braking is sharp when you press your brake pedal and I believe the 280 MC doesn't use that part.

Best to use the 230 MC on a 230SL though.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

MikeSimon

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Re: 1970 280SL Brake master cylinder swap question
« Reply #3 on: February 25, 2022, 14:46:45 »
How about the in-line brake modulator. Do all W113s have taht?
1970/71 280SL Automatic
Sandy Beige
Parchment Leather
Power Steering
Automatic
Hardtop
Heated Tinted Rear Window
German specs
3rd owner

Benz Dr.

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Re: 1970 280SL Brake master cylinder swap question
« Reply #4 on: February 25, 2022, 19:32:03 »
How about the in-line brake modulator. Do all W113s have taht?

That's for cars with rear disc brakes. Prevents them from locking up under hard breaking.
1966 230SL 5 speed, LSD, header pipes, 300SE distributor, ported, polished and balanced, AKA  ''The Red Rocket ''
Dan Caron's SL Barn

1970  3.5 Coupe
1961  190SL
1985   300CD  Turbo Coupe
1981  300SD
2013  GMC  Sierra
1965  230SL
1967 250SL
1970 280SL
1988 560SEC

h100vw

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Re: 1970 280SL Brake master cylinder swap question
« Reply #5 on: February 26, 2022, 06:25:50 »
Thanks for the insider knowledge Benz Dr. I'm going to plead stupid with the supplying shop and see if I can exchange it for the correct one.