Front brake shudder

Hi Guys,

I've posted on this forum about rear brake issues, seemingly around a sticky caliper piston.

I'm now experiencing front brake shudder (my honda seems to have a sense of humour around brakes lol).

I have a 2009 Accord Type S. The front calipers are dual piston. I have recently (~6-9 months ago) changed the guide pins, rubber boots, pads and discs on the front.

Previous to that I had experienced brake shudder. Immediately jumping to conclusions I blamed it on warped discs.

Having had the discs replaced, within the week the shudder had returned. At the time I didn't have the cash to try and address the issue. Now I do and I am looking for advice.

There seems to be 4 common ***umptions around brake shudder:
1. Warped discs
2. Sticky, or partially sticky caliper
3. Collapsing flex brake line
4. Failed Suspension bushings

Having 99% ruled out option 1, I wanted peoples opinions and experiences on the other 3 issues.

The shudder is felt through the car, not the steering on brake peddle. It feels like the car is lurching slightly as it shudders. It is felt when the cars decelerates through ~40mph to stand still.

That's as much info as I can think of right now.

Also, are there any tricks of the trade to identify which side the issue is with. The car isn't pulling at all when under braking when the shudder happens.

Have you tried swapping wheels front to back to eliminate rims and tyres from your enquiries?

I have same car.

the best option you have is to take off both front wheels and check the brakes.

my front right caliper was sized and i left it too late and destroyed the right side disc with scratches from the fully depleted brake pads. this was caused by a seized piston. i know it was a seized piston after ichanged the pads and disc because of the uneven wear.

i did scope out co's like big redds and brake refrub co's. but didnt fancy having taking me caliper off and being car dead.

i did a tone of researvh and its like this 9/10 times its a seized caliper.


solution:

take the wheels off.
check the wear rate of both brakes in/out pads.
regrease the slider pins with special silcone or red rubber grease and be generous. job done.

else a new set of 320mm brake disc are 100£
and new greenstuff is like 70£

this is my take

Swapping wheels is a good call.

I've had the front wheels off and discs and pads changed. No noticeable uneven wear. I think it may be that one piston has more friction than the other, as that has been identified as a possible cause of the shuddering before.

I'm probably completely wrong, but possibly air in the brake line on one side causing the abs to partially enable on the stronger side? Maybe bleed the system and change the brake fluid.

Definitely the cheapest option before changing parts out of chance?