I was driving down hill heard a nasty noise and then grinding. Took off back tire and low and behold the rotor completely cracked all the way around. Can I drive it to the parts store to get a new one?

I would not.

likely they won't have the rear rotors anyway. call around first. you should be able to get them delivered.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

If it is already making noise it could fail causing unknown damage. Lets hope nothing else is wrong.
What do you think made it crack? I have never heard of this before. it sounds like it got overheated somehow. You better figure that out. Brake discs don't just crack for no reason. At least bleed the brakes well and check the calipers well while your in there. Check them for proper movement and return. It could be a emergency brake issue. Something probably got that rotor very hot.
Also you want to do both rotors and pads at once. Keep the brakes balanced.

__________________

Chris
84 280sl
82 300d euro

Gwenn, you are not all that far from the Foster, Columbia or the Vancouver PNP`s. the rear Rotors on the w116, w123, and w126 are the same at least up to 91. I see almost new ones sometimes quite often.

I agree that driving with this bad Rotor is dangerous. The other side could be as bad? Be good to do a real good inspection of your whole Brake system.

How long have you had this car?

I saw one on a 126 gasser last month in a PNP, that the R/R Rotor was worn down so thin, it broke off from the "Hat" part of it. was a ring held on by the Caliper and Pads.

Note:

I now realize the OP has a 87 300TD W124. the W116, W123 and W126 rear Rotors will not fit this chassis.

However if there are some W124`s in the PNP`s, they may fit your TD.



Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

This is a rare failure. I would look at the caliper function and also check that wheel for wheel bearing failure which might allow too much wheel hub and rotor movement.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

I've seen it plenty of times.
it happens when the brakes are not changed when they wear out... steel on steel tends to eat rotor material quickly. also, it happens when the pads are changed, but the rotor is not.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Whenever I see something like this, I think of John's wire coat-hanger brake pad fix

__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

heh, THAT was a good repair!

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Guess I'm not hanging out the right places!

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

My 77 300d had the disk/disk hub separation issue when first acquired. I suspect it is no longer as common as it once was. Based on no reports on site for a long time. The casting is thin there.

I replaced both back rotors, all is well.. I need advice on how to fix the throttle. The plastic piece on the bracket is broken. I can't keep the idle adjusted, and it has stuck wide open twice, lucky for me I noticed the petal gets floppy right before it happens.

I had the rotor fail in the same way on my 240D. I limped it five miles down the dirt road to where I worked and brought in a replacement rotor and changed it there.

On the linkage, how about replacing the broken bracket?

__________________
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 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

I haven't been able to locate the exact part that broke..not even sure what its called. I did get a new throttle socket but the bracket is a no go, I would like to replace it with something metal the plastic is crap..

Check the junkyards for the part.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Since you didn`t list the year of your 300TD, I was assuming a W123. Looked up your info and some past Threads, you have a 87 300TD, a W124.

You should post the info in your Signature.

Iam adding info to post #4 that those Chassis models are not relevant to your W124.

Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works