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Posted

Hi everyone, new to this forum - refugee from LCOOL.

Had a minor shudder when applying the brakes. Also was somewhat intermittent. Having over 100k on the

clock a lot which were done towing a big van, I thought I may have warped a disk. Checked them with a

dial gauge but no useful info.

Bit the bullet and replaced all 4 with new slotted rotors and pads from DBA. Huge difference in braking. However the shudder

has return almost with a vengeance. Thought I fixed the problem when I disconnected the ECU for another

unrelated issue. ECU is remapped, car went in limp mode and could not clear it with the scangauge.

Problem not fixed and I am lost as to why this is happening. Plan on visiting Berima Diesel later on this year

to have the injectors checked and I'll get them to look at the brakes if I still haven't figured it out.

Any suggestions would be welcomed.

Thank you  

Posted

BTW forgot to mention that there is no shake in the steering wheel. The 'shudder',

really hard to describe but almost like brakes on and off. Cannot identify front or rear

or both. Got me totally miffed. 

  • 3 months later...
Posted

UPDATE.

Got in contact with DBA, explained the problem and they asked for pictures of the rotors.

These were supplied and the response was slight pad deposit which would cause 'DTV'. That is the

technical term for Disc Thickness Variation. Why would I have that? Vehicle has travelled 30K km

since the brakes were changed, easy driving and no towing. Was I suppose to use DBA pads instead

of Repcos. No mention anywhere that this is the advice - website, box etc.

In desperation had a conversation with a chap at Autobarn who seems to know his stuff, not just a salesman.

His comments were that rotors are more prone to being damaged than discs with a built-in hub. Reason being

that if they do not sit 110% flat against the hub or that wheel nuts have not been tightened correctly damage

could happen. Whenever I have taken the wheels off, the wheel nuts are torqued to 140Nm and in the correct

sequence when re-installed. Who knows what happens at a tyre shop. Apparently even a minute spec of corrosion

on the hub could cause this. What a lot of BS I thought. So, pulled the brakes off again for the third time in as many days

and took them to a machine shop.

Cut a long story short, they required an ever so slight amount of skimming. After 30,000 kms? Thickness of pads

is 1 mm, yes 1 mm, less than new. So when I say easy driving, I mean easy driving. Most of the shudder has gone now.

I say most because the rears probably will require skimming.

Am I looking at going through this whole BS 30,000 km from now?

BTW, also got a lecture from DBA about not using a 'qualified' mechanic. So I asked, what would this so called 'qualified'

mechanic have done different. And where do you find one? Certainly not at a Toyota Stealership.

Posted

Shudder in 200 series can & will come from a over adjusted hand brake shoes & cables.

Jack up under the axle un adjust the hand brake cable in cab then back off the hand brake shoes then readjust the shoes so the wheel turn freely then adjust the cable in cabin just enough for it to hold at with about 6 clicks too tight causes shoes to drag.


Posted

Thanks for that but handbrake hasn't been touched in over 50,000 kms. Last time was when the

car was serviced at a Toyota Stealership ( fixed price) and they over tightened it.

Posted

Fitting new new rear rotors without adjusting the the shoes to the new unworn diameter is asking for trouble with overheating the rear rotors causing distortion I have worked in the brake industry for about 40 years & what I don't have an idea about what's going on is not worth knowing.

Dtv can come from machining practice from new to in field machining as well as installation procedure & what to look for prior to fitting.

Ray.

  • 3 weeks later...
Posted

No handbrake on front rotors. Will get the rears done soon. My take on this (time will tell) is that the castings have not cured/seasoned

enough when fitted. Similar concept when in days gone by when building a race engine (NASCAR) using a cast iron block. Wisdom was

to use a 'used' block or leave the new one out in the weather for 12 months to cure/season.

  • 2 months later...
Posted

Had the rear rotors machined. So far have travelled under 10k kms and the problem has come back,

albeit not as bad. Will have a chat with the guy who machined the rotors and DBA also. Maybe need to replace

with genuine Toyota items. 

  • 4 weeks later...
Posted

I feel your pain, I just about have an identical issue. Never had a shudder  until I (supposedly upgraded) my brakes

Only difference is I replaced my originals with new dba pads & rotors. Certainly stopped great, but had nothing but issues. Had them machined a few times. I would only get a few thousand kms and it would start again. Replaced again with another brand that (won't have this issue) and after first trip towing the boat, guess what? 

Something has definitely changed since first replacement. As nearly 200k of issue free driving/towing, now nothing but repeated brake shudder and same story from different mechanics?

 

  • 2 weeks later...
Posted

None of this makes sense. Interesting to see you used different pads - DBA pads. I fitted Repco

ceramic blend. At one stage I thought the pads were leaving something behind which would be 

the cause for DTV (disc thickness variation) but you are experiencing the same problem with

different pads. Maybe Toyota has a built in sensor to ensure you replace worn brakes with

Toyota OEM. Ah Ah.

Posted

Hi Larry can you post the photo of the disc rotor with the so called pad build up interested to see what they consider pad build up.

Ray.

Posted

Sure. Cannot find the photos as they were probably on my phone. I did find the email sent

to DBA with the photos. If you have any problems with the attachment, send me your

email via PM and I will forward you all the emails to DBA.

Larry

Discs.zip

Posted

Hi Larry I can't open the file  I am waiting for NBN tech tofix our wireless NBN & to add insult to injury Telstra have decided to undertake repairs to the local mobile phone towers.

Will have a go on Saturday when Telstra will be finished.

Ray.

 

  • 4 months later...
Posted

Update. Looks like I may have got to the bottom of this issue. Purchased ceramic blend pads from

Repco to fit with the DBA slotted rotors. After another dismantling of the front brakes found the pads

were shedding chunks. It seems that this in turn caused DTV (Disk Thickness Variation) as these

were 'depositing' pad material. Repco did give me a refund on the pads but also admitted that those

pads were not suitable for slotted rotor application. Fitted different pads, new rotors and so far so good. 

Posted (edited)
4 hours ago, larry200 said:

Update. Looks like I may have got to the bottom of this issue. Purchased ceramic blend pads from

Repco to fit with the DBA slotted rotors. After another dismantling of the front brakes found the pads

were shedding chunks. It seems that this in turn caused DTV (Disk Thickness Variation) as these

were 'depositing' pad material. Repco did give me a refund on the pads but also admitted that those

pads were not suitable for slotted rotor application. Fitted different pads, new rotors and so far so good. 

Some years ago I used to own a Commodore VSII, and for the heck of it I tried DBA slotted rotors. They worked fine, but whenever doing heavy braking, they would go  "GRRRRR". I could hear and feel the slots as they passed under the pads.

 

@Larry200. Curious to know if your slotted rotors also growled ??

 

Anyway, I surmised that slotted rotors were more for rally/race, or people that were more tolerant of noise, so I ended up going back to plain rotors.

Combining plain rotors with Bendix Ultimate pads gave me good "bite" from cold all the way up to 350 Celsius. That is about the equivalent of 2 emergency stops from 100 km/h, in quick succession.

Beyond that temperature, the "bite" falls off, but it's still useful, and the spec sheet says that you can get the pads up to 550 Celsius without damaging them  i.e. they'll come good upon cooling off again. At one time, going down a long steep mountain descent, I decided to see how far I could "push the envelope".  When I got to the bottom, the brakes were fair stinking, and the rotors had turned blue, yet the pads recovered perfectly when they cooled off.

The only drawback with Bendix Ultimate was that they dusted like crazy, and rotor wear was significant, but bearable. At any rate, the rotor wear was so even that I never needed to get them machined when fitting new pads, so that compensated partially for the high wear rate.

But that all happened over 10 years ago .........

 

Edited by KangaRon

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