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Brake & Tire

Brake clonks while reversing

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This is common and is not a fault only a nuisance--it is because of the way the calipers sit. When in reverse, and you brake, the force on the assembly is in the opposite direction as when you drive forwards, and the small amount of play in the calipers make them clonk the other way. This also happens on Peugeots which also have the same assembly. Original brake pads behave better than cheap pattern ones.

Martin GUTKOWSKI

Brake valve

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Although there is a so-called repair kit for the brake valve, this only contains replacement rubber seals. These seal the valve to the outside but they have nothing to do with the functioning of the valve itself; the sealing of the working elements rely on the very close tolerance between those parts. Once the pistons inside the valve or the cylinder they travel in wear out, the valve starts leaking (this means leakage into its return lines and not to the outside world).

Changing wheel bearings

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Undo the driveshaft nut (get someone to stand on the brakes while you do this, jack up the side concerned with axle stands, remove the anti-roll bar top swivel). Wire brush the threads as the nut disappears at the end, remove the steering arm and the brake caliper, tie them up, remove the hand brake cable bracket and the brake disc, remove the lower swivel, the driveshaft nut, the bolt holding the hub to the strut--be careful not to pull the driveshaft out of the gearbox or else you will lose the gearbox oil. Now you have the hub in your hand.

Cleaning tires

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Avoid silicone based products, they are rather harmful, although it might seem different at first sight.

Intermittent ABS failure

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The most likely cause is intermittent connection to a sensor (or possibly an intermittently failing sensor) which is OK with the car level and the wheels in the straight ahead position, but which breaks when wheels are turned or the body tilts.

Rising back end while braking

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This is a sure sign of air in the rear brake circuit. Bleed the whole system including the brake valve.

Chris STUART

Selection of tires

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A tough question. It depends on your requirements, driving habits and, last but not least, the amount of money you are ready to spend. Many of us find Michelin tires to outperform other brands mainly because their different, softer composition is better suited to the suspension and riding characteristics of Citroëns. I also found them to last much longer than, for instance, the Pirelli tires of the same price and performance class I had on the car before. But all that having been said, you will find other BXers who left Michelin for another make and don't regret their choice.