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  #1  
Old 08-31-2013, 09:53 AM
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Couple Brake Questions

I have to replace my right rear caliper in my car; a 1978 300D. Do the calipers have to be replaced in pairs? If I do one, do I have to do both?

I will also be doing the right rear rotor, and the same question comes to mind. Do I need to do both if I do one?

I'll be doing both front and rear brake pads while I am in there. CARQUEST seems to show that the pads for front and rear are the same which doesn't seem right to me. I'm going to CARQUEST because of the Canada ~ USA shipping extra charges B.S. and because I have a good relationship with the guys behind the counter there.

Thanks in advance

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Old 08-31-2013, 10:58 AM
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Quote:
Originally Posted by aieeegrunt View Post
I have to replace my right rear caliper in my car; a 1978 300D. Do the calipers have to be replaced in pairs? If I do one, do I have to do both?

I will also be doing the right rear rotor, and the same question comes to mind. Do I need to do both if I do one?

I'll be doing both front and rear brake pads while I am in there. CARQUEST seems to show that the pads for front and rear are the same which doesn't seem right to me. I'm going to CARQUEST because of the Canada ~ USA shipping extra charges B.S. and because I have a good relationship with the guys behind the counter there.

Thanks in advance
The calipers don't have to be replaced as a pair. The rotors should be as you can expect the same amount of wear on both sides. Rear pads and rotors are replaced about 1/2 the frequency of front rotors and pads. I don't know about pads on a W123 but the front and rear pads on a W126 are different. The rear being smaller. Check Pelican Parts for the part numbers and see if they match. A lot of box stores like CQ screw up on MB parts and their systems do not reflect accurate exchangeable parts.
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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Old 08-31-2013, 11:20 AM
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Thanks for that. I kind of figured that the pads would be different since the calipers definetly are.
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Old 08-31-2013, 05:30 PM
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You don't have to change calipers in pairs, but if one goes bad, there's a good chance the other isn't far behind, and they aren't very expensive or difficult to change, so there's a case for doing both at once.
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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 367,xxx miles
08 Triumph Street Triple 30,xxx miles, lowered 10mm in front, Pirelli Angel GT tires, EBC HH brake pads, otherwise stock.
88 Jaguar XJS V12 93,xxx miles. I should be in the garage now.
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Old 08-31-2013, 06:15 PM
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Originally Posted by Skippy View Post
You don't have to change calipers in pairs, but if one goes bad, there's a good chance the other isn't far behind, and they aren't very expensive or difficult to change, so there's a case for doing both at once.
I bought the kits to rebuild my calipers on the 300SD. It's not a difficult task and if you have the time, it will save a few bucks. I'm still rolling on my home-rebuilt calipers.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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