Question about Hyundai Motor 2003 Sonata

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Knocking on pedal when braking

Hyundai trajet 03 plate 2l deisel, when I brake the brake petal knock brakes fine could it be warp on disc happens more often had pads do 1000 miles ago but getting worse

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  • Eric kaiser May 11, 2010

    you are correct the most likely cause is the rotors are warpped and should be replaced where the rotors machined when the pads were replaced?



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I have same prob but mines diesel 02 .
it's the abs rings get them for about £17 hyundai say they dont do them you have to get complete unit drive shafts comes as 1 ,approx £350
i thought mine was the disc's but very rare, abs rings 100%

Posted on Feb 03, 2010


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Brake lights do not work till brake petal is all the way down

Sounds like the switch is faulty or has been knocked out of place. Check at the pedal itself, get down and look for the switch, it will be the push type. When you press the pedal down you will see a switch being released, this is the thing controlling the brake lights. Hope this is helpful.

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Probably not your tail lights but your brake lights. What commonly happens is that the switch either goes bad and sticks closed or it gets knocked out of position.

The switch should be mounted under the dash up around the steering column where it can contact the brake pedal arm. When not applying the brakes the switch has a piston-like piece that rides against the steel arm going up from the brake pedal. In this depressed position the brake lights are off. When you press the brake pedal the piston extends and the brake lights come on.

The switch is typically about 2-3" long and 1-1/2" height and width with one or two wires attached to it. It will be attached to normally an unpainted metal plate bent at 90 degrees and mounted where the switch will be directly in front (towards the firewall) of the brake pedal arm. If its been knocked out of position you'll need to get it remounted and positioned where the piston is depressed with the brake pedal in its normal position and the piston comes free of the brake arm when the pedal is depressed. It's a two person job. Ti check to see if the switch works just press the plunger in and the lights should go off. If not replace the switch.

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Person driving behind me said he notice my left front wheel shaking when I was braking

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Oct 19, 2012 | Cars & Trucks

1 Answer

Ford mondeo mk2 clunking noise o/s/f when braking

Brake discs do not warp though unless the brake disc is running true to a very fine tolerance (max 0.004") it will resemble a wobble plate and the brake pads will wear off the high parts resulting in a disc of varying thickness.

Tight caliper operation will prevent the piston(s) moving back the correct 0.002" to prevent rubbing when the brake is not being used.
A brake that runs hot due to constant rubbing does tend to shorten the life of the hub bearing.

Lift the caliper piston dust cover and use a strong light to examine the piston. Overhaul or replace the caliper if the piston doesn't appear completely clean and shiny.

Check the (fitted) disc runout with a dial gauge and keep cleaning the mounting faces until the runout is better than 0.004".

Check ball joints and track rod inner and outer ends for free play, suspension joint condition and shock absorbers for security, leaks and effectiveness. Check the tyres for bulges, etc. and wheels for excess runout...

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1 Answer

Brake lights stay on

The most probable cause is a sticking brake light switch. The brake light is activated by a small switch mounted under the driver's side, up near the leg of the brake pedal. That switch is spring backed so that when you depress the pedal the shaft of the switch is let forward and turns on the brake light. That switch sometimes comes loose or half cocked in the housing and stays activated all the time until you let the brake pedal loose and the leg of the pedal depresses the switch shaft just enough to turn off the brake light. The solution is to replace the switch, at about 15 bucks at your Advance Store. or 10 bucks plus shipping on the internet. You can check when you leave the vehicle to see if the brake lights are still on. Mind you, this does not happen all the time as sometimes it is cured by the action of the brake pedal knocking the shaft back in line

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Ford transit 02plate/fwd brake judder..ive had new pads/discs,cv joint,bearings,drive shaft.yet i still got juddering when breaking(not as bad as b4)garage says only thing left is faulty discs(very slight...

you mention replacing the discs/pads. how long ago? the fault described is usually caused by warped brake discs as you mention it comes on the onset of braking. i advice replacing the discs.

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3 Answers

Whenever I brake there is a knocking noise that gets progressively slower as the car comes to a stop. This does not happen in reverse.

Sounds like you have warped disc rotor or a worn out or a loose brake pad. Worst case you may have bad CV joint.

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1 Answer

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Probably a disc brake pad scraping on a warped rotor as it goes around. When you apply the brakes the warped rotor causes the car to pulse or shake as the rotor goes around and applies the brake unevenly. You need a front brake job.

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