W112 300SE brake rebuild - Mercedes-Benz Forum

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post #1 of 12 (permalink) Old 11-20-2013, 05:15 PM Thread Starter
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Date registered: Nov 2013
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W112 300SE brake rebuild

I am in the process of rebuilding my brakes. I need to replace the rear piston seals.
They are the 40mm ATE or Dunlop type.
Any information on these parts would be much appreciated. I'm told they were used on a particular model Jaguar. Does anyone know what model Jaguar? Does anyone know part numbers?
Thanks in advance for your replies.
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post #2 of 12 (permalink) Old 11-20-2013, 06:31 PM
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don't have any part #s, but prepare for $$. The dunlop brakes were also used on the 300SL roadster. What year is your car? 62?
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post #3 of 12 (permalink) Old 11-20-2013, 08:12 PM Thread Starter
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'65
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post #4 of 12 (permalink) Old 11-25-2013, 10:57 PM Thread Starter
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bump
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post #5 of 12 (permalink) Old 11-26-2013, 12:13 AM
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Was your car AUS built? I believe some were, those for the home market naturally, is that right?
I just found out that my car had Girling front discs that are apparently smaller than the ATE but I kept them despite the significant upcharge because I have never found the brakes lacking even with drums on the rear, and I think future owners may appreciate original issue parts and I know I do so what's the harm? If you can keep them, as it seems you intend, good on you. Contact the Classic Center, I would think they can help. Your dealer may even have access to the PN# info from his parts counter computer. Call them first.

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Last edited by DirectLA; 11-26-2013 at 12:19 AM.
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post #6 of 12 (permalink) Old 11-26-2013, 05:53 AM Thread Starter
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Quite right. Some Finnies were assembled by AMI here from ckd parts and panels. The 300SE sedans weren't though.
My front brakes are fine. It's the rear I am trying to fix.
The thing about dealers here is they don't know about anything that is more than twenty years old. I have found Mercedes dealerships in this country to be useless.
Classic Centre search returns "0 parts found". Besides, the people I usually deal with for parts would have already tried the Classic Centre.
Everybody tells me the Dunlop brakes from Jaguars are exactly the same but don't know which model Jaguar.
Would the seals from a W126 be the same?
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post #7 of 12 (permalink) Old 11-30-2013, 04:10 PM
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Hi Mick, have you tried contacting Chris Stewart in Melbourne to see what he knows? bikesncars@optusnet.com.au
I have some 3-piston calipers on my old finnie. The brake shop had to hunt around for quite a while to get their seals - turns out they were also used by a 1963 Humber Super Snipe. If you measured up the pistons, you could perhaps call All Brake and Clutch in Brisbane on 07 3277 7591 and see if they can track something down.
My 1966 300 coupe has those calipers on the back too but I am a year away from looking at that.
Cheers,
Drew
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post #8 of 12 (permalink) Old 12-03-2013, 01:11 AM Thread Starter
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Originally Posted by drew56cus View Post
Hi Mick, have you tried contacting Chris Stewart in Melbourne to see what he knows? bikesncars@optusnet.com.au
I have some 3-piston calipers on my old finnie. The brake shop had to hunt around for quite a while to get their seals - turns out they were also used by a 1963 Humber Super Snipe. If you measured up the pistons, you could perhaps call All Brake and Clutch in Brisbane on 07 3277 7591 and see if they can track something down.
My 1966 300 coupe has those calipers on the back too but I am a year away from looking at that.
Cheers,
Drew
Yes Drew. I know Chris quite well. He has just used his last set on one of his 300SE's.
I'm going around in circles. All the Merc forums tell me "They're the same as a Jag." but when I ask "Which model Jag?", they just fluff about. They either don't know or don't want to tell. They also say they're the same as the 300SL but "you don't want to buy those". I will be the judge of what I will or won't buy.
I have been making progress though. Most brake parts suppliers ask "What car is it for?" and when I tell them, without allowing the thought to sink in, they reply "Can't help you mate." Luckily I have found a fellow who is old school. "What's it from?" he asked. "A car and that is all you need to know." I replied.
With that minimal information, and the callipers on the bench in front of him, we discovered he had one seal in stock, and plenty of them. Just trying to work out the dust cover now.
Are you sure you have the 40mm on your coupe? Being a '66, you could have the 42mm or 38mm pistons. Much easier to source bits for.
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post #9 of 12 (permalink) Old 12-03-2013, 07:41 PM
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Good one Mick.
Turns out I had my dates of my 3 coupes mixed up - the 300 is actually the oldest one, from August 64. I guess that means I will be in bad brake land when my time comes?
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post #10 of 12 (permalink) Old 12-04-2013, 04:12 AM Thread Starter
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Originally Posted by drew56cus View Post
Good one Mick.
Turns out I had my dates of my 3 coupes mixed up - the 300 is actually the oldest one, from August 64. I guess that means I will be in bad brake land when my time comes?
I think you'll be right. I would expect that one to have the 38mm piston. I thought the 40mm pistons were only in some '65's.
I'll confirm with Chris next time I see him. He has that info.
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