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Disc brake caliper bolts extremely tight!!!

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Court
Posts: 484

Disc brake caliper bolts extremely tight!!!

Post#1 » Sat May 04, 2019 1:49 pm

The 19mm bolts holding my caliper on my 2000 300GDT are extremely tight and so far refuse to budge.

They are only accessible with a box end wrench which I have tried to extend another wrench but so far nothing budging.

I have tried a bit of heat but am a bit concerned to not over heat things although it must get fairly hot there during extended braking I assume.

So far I have used mild brute force only and might try to get a very snug fitting box end. Mine is a Home Depot Husky and I think the fit could be tighter.

If anyone one has a trick to this I would appreciate it. I checked to see if the rotor would loosen and it did very easily. So maybe I am not being bold enough but there is scant room to get a big lever on uppermost bolt.

I have used some WD40 since do not have any other penetrating style oil at hand, maybe eventually this will assist.

Thanks in advance.

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pierre repairs
Posts: 1820

Re: Disc brake caliper bolts extremely tight!!!

Post#2 » Sat May 04, 2019 2:04 pm

Court encountered the same with my 98 LWB
I used impact wrench and long lever
G300TD - W463.331 & G250 - W461.401 Wolf LL

Court
Posts: 484

Re: Disc brake caliper bolts extremely tight!!!

Post#3 » Sat May 04, 2019 2:42 pm

Hi Pierre

Cannot use impact wrench because sockets have not enough clearance. The bottom bolt almost has enough. There might have been a special skinny omg docket for it I suppose. However the upper bolt can only be by hand wrench.

If I can get the bottom one loose I think the top can be loosen by moving the caliper ever so slightly.

Did you use any heat??

I need to get a good wrench extender.

Court
Posts: 484

Re: Disc brake caliper bolts extremely tight!!!

Post#4 » Sat May 04, 2019 2:43 pm

Long socket that is supposed to say.

autonovice
Posts: 1846

Re: Disc brake caliper bolts extremely tight!!!

Post#5 » Sat May 04, 2019 7:32 pm

Court, I have 19mm 3/4 drive socket and breaker bar. I use a pipe to get more leverage. I can stop by your place tomorrow with the tool along w/ the rear mud flaps if you want. I ll be spending time at my bat cave tomorrow morning.

goat
Posts: 925

Re: Disc brake caliper bolts extremely tight!!!

Post#6 » Sat May 04, 2019 7:49 pm

Grind the outside of the socket a bit and use an extension so you can get the socket square on the bolt. That's what I had to do.
1984 W460 280GE Cabrio

Court
Posts: 484

Re: Disc brake caliper bolts extremely tight!!!

Post#7 » Sat May 04, 2019 10:01 pm

Hi Minh,

Ok I am open to that Minh, Let me know your best time.

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cal_w460
Posts: 1582

Re: Disc brake caliper bolts extremely tight!!!

Post#8 » Sun May 05, 2019 2:06 pm

You can take a normal 19mm socket and cut down the length of it with an angle grinder. To get a really "shallow" / short socket. Then it will fit the lower caliper bolt fine. Add an extension and use impact wrench or long bar. This works great on a w460.
w460.333 1982 Colorado Beige 300 GD OM617.931

Court
Posts: 484

Re: Disc brake caliper bolts extremely tight!!!

Post#9 » Sun May 05, 2019 3:46 pm

Ok thanks everyone. Would you use a 6 or 12 point socket? I am thinking a high quality sic point would less likely lead to rounding.

gullywagen
Posts: 311
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Re: Disc brake caliper bolts extremely tight!!!

Post#10 » Sun May 05, 2019 4:35 pm

I did exactly what Cal describes with the socket. Did the trick for me. The six point will have more contact with the bolt. I used a length of pipe over my socket wrench to add leverage
1991 GD290 cab chassis

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