Put on a set of 30 x 9.50 x 15 mud tyres on at the weekend (on 15 x 6jj steel rims) and am now getting a heavy shudder on braking even if braking at low speeds. Tyres have between 7mm and 10mm of thread. Wheel nuts are tight and air pressure should be fine. Balance on wheels should be ok and getting tracking checked today. Anyone any advice or know if this is to be expected with the mud tyres on.
Shudder on braking
- Thread starter danielj
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They are a Savero tyre. They are marked AT but have the blocky lugs type thread. Will try to post a pic later.
Didn't have the problem with the shudder though before and the wheels I had on had a much greater offset and should have been putting more strain on the steering parts than the new wheels and tyres. (By the way, I put this in the General Non Vehicle Specific section because these are on the Mazda B2500 which has the much the same set up as the T2 except it has leaf springs in the back).
Didn't have the problem with the shudder though before and the wheels I had on had a much greater offset and should have been putting more strain on the steering parts than the new wheels and tyres. (By the way, I put this in the General Non Vehicle Specific section because these are on the Mazda B2500 which has the much the same set up as the T2 except it has leaf springs in the back).
Seem to be but will be taking them apart tomorrow also for a look. It is a bit odd that you can feel a bumping on the brake pedal when applying the brakes that does correspond with the wobble.
Toolbox
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A bumping on the pedal would suggest, that you have a warped disc.
briggie
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my thinking exactly :thumb2
JimmyJaffa
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Faulty abs (If fitted)
Thanks all for comments and suggestions. Here's the news. Gave the truck a good look over today. Had wheels off. No signs of anything rubbing. Nothing loose on track rod ends, steering stabiliser, ball joints and all rubber bushes and booths look fully intact and free of any leaks or signs of oil. New shocks and bushes in front fully intact and tight. Took off calipers in front and drums in back. Boths sets of brake pads intact, clean and plenty of use left in them yet. Brake cylinders have no leaks and rubber boths clean and intact. Inside of rear brake drums smooth and front disks smooth and no great degree of wear. Hard to tell if is any warping on discs but no signs of it when rotating disks. One shock absorber in the back is gone. (Oil running down it so have to change that.)
Then tried putting back on the original stock steel 16 inch rims with 205 x 16 tyres on the front only and gave it a run. Situation exactly the same. Then also changed the back wheels and put the stock rims and tyres on the back also. When took if for a run it ran fine. No vibrations or shudder on braking and truck ran in more of less a straight line when took hands off the steering wheel.
So I am at this point thinking it is a problem specific to the mud tyres on the rear and may not be related to the front streering components at all. Only thing I can think of is that because the truck is a pick-up and stiffly sprung and very light at the back when unloaded the new mud tyres on rear with much less offset on wheels are bouncing when gripping on dry tarmac. And the goosed shock on one side is probably not helping.
Anyone any other thoughts.
Then tried putting back on the original stock steel 16 inch rims with 205 x 16 tyres on the front only and gave it a run. Situation exactly the same. Then also changed the back wheels and put the stock rims and tyres on the back also. When took if for a run it ran fine. No vibrations or shudder on braking and truck ran in more of less a straight line when took hands off the steering wheel.
So I am at this point thinking it is a problem specific to the mud tyres on the rear and may not be related to the front streering components at all. Only thing I can think of is that because the truck is a pick-up and stiffly sprung and very light at the back when unloaded the new mud tyres on rear with much less offset on wheels are bouncing when gripping on dry tarmac. And the goosed shock on one side is probably not helping.
Anyone any other thoughts.
No abs.
Thought I should clarify that the problem I had is solved. Problem was not tyres, brakes, steering but "user error". In otherwords, I never spotted that the lump in the inside of the rim where the valve is fitted (valve stem fitted inside the face of the rim) was touching against the rear hubs when nuts were fully tightened. This meant that the wheels were not on the hubs perfectly straight. There was a slight wobble on the road but great shudder when braking. Also discovered that one rear shock was shot and this probably wasn't much of a help either. 10mm spacers fitted on the rear and all sorted.
So thanks for the suggestions all.
So thanks for the suggestions all.
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sounds silly but are your tyre pressures be wrong, or just too high?
Maybe I'm not explaining myself too well and it sounds stranger than it is. I think the idea is to offer more protection from damage to the valve stem in off-road use.
