After i bought my 84 300D, the front brakes (bendix) started squealing a bit, so i changed the pads. Squealing kept getting worse, so I added shims behind the pads with brake quiet and changed the rotors. No help, just kept getting worse. Changed the pads again and put on fresh rebuilt calipers, still no help, and im losing my mind. What else could it be??

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1984 300D Turbo

Maybe its time to replace the brake hoses too. Thats how i got rid of the squeeling on my rear brakes.

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'85 300D Cal 280,000 miles
'14 GLK 350 60000 miles

The hoses are really the only things that havent been done. Really think that could cause squeal?

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1984 300D Turbo

what brand pads are you using? what construction?

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
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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!

I think the first change i used Textar. This time I tried the Mintex, both from Autohauz.

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1984 300D Turbo

Go with ceramic pads! I made the mistake of buying the Mintex pads on my 82' 300TD and they made a lot of noise, not to mention a lot of brake dust! My mechanic said "Well no wonder! You bought the cheapest pads they make!"

I would second the suggestion to replace hoses... I had the squealies on my new-to-me 190D, and I had to do pads, rotors, calipers, and hoses to get everything quiet again.

Kurt

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- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride!
- '86 190D (W201-126) - 2.5 NA engine, 5 speed, cloth interior, manual climate controls, 33-34 mpg (sold to forum member).

Any recommendation for ceramic brand and where to get them? The noise is making me nuts.

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1984 300D Turbo

In that case, perhaps you could explain the "cause and effect" relationship between brake hoses and noisy brakes. I am having a difficult time connecting those "dots."

I've read elsewhere in the forums that brake hoses are multiple layer, and that the inner layer can break down. This can have the effect of creating a "one-way valve" where your foot pressure pushes fluid to the caliper, but then the inner layer collapses against itself trapping pressure on the caliper side of the hose defect. Just the theory I've heard...

Kurt

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- '79 240D - engine swap complete! Engine broken in! 28-31 mpg! Lovin' the ride!
- '86 190D (W201-126) - 2.5 NA engine, 5 speed, cloth interior, manual climate controls, 33-34 mpg (sold to forum member).

The one way valve effect is certainly a real possibility. But I don't see how it would cause the typical brake squeal.

mm, happens a lot, especially when people use locking pliers to crimp the rubber hose shut when working on the caliper...

If your hoses have had this done, or are 10 years old, change em, they are cheap maintenance.

Brake noise is caused by high frequency vibration,this is why some cooper grease on the back of pads and on the anti rattle shims stops it,it soaks up the vibration.

Check the fit of the pads also at the bottom where they sit on the caliper and at the top,sometimes the pads back plate has a rough edge instead of smooth and this causes them to stick or pass noise on.

The disc can also pass noise if there is no copper grease or equivalent between it and the hub.

I slathered Disc Quiet on the back of the pads both times i changed them, helped none. Matter of fact, when I changed the pads the second time, the Disc Quiet was still there on the old pads, so Im pretty sure thats not the source, or else it would have worn through making metal to metal contact.
The double hose is interesting, but even if it traps pressure against the caliper, how would this cause squeal?
My only option is to try the ceramic or organic pads I guess.

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1984 300D Turbo

Cut a thin piece of brass shim 12 - 15 thou and place under the pad. Cut the strip long enough to allow a 1/2" bend over each end so the shim won't slip out and just the width of the backing. Let us know if this works for you.
Squeal is caused by the pad grabbing and letting go, an up and down motion in the caliper. reduce the space for this motion and the squeal should go away.

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1984 300SD turbo 126
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