Kreidler front fork overhaul: seals, oil and setup

Published on 7 October 2026 · 2 min read

A leaking front fork drips oil onto your brake and no longer damps. Overhauling it is well within reach and takes an afternoon. This article walks through the steps.

How you know it is time

Oil on the stanchions or a greasy ring at the seal
The fork dives under braking and returns slowly
A knocking noise when the fork compresses over a pothole
Rust or pitting on the stanchions — the cause of most leaks

Stripping down

Put the machine firmly on its stand with the front wheel clear. Remove the front wheel, mudguard and brake cable first, then whatever headlamp and handlebar parts are in the way.

The stanchions come out of the yokes once the clamp bolts are loosened. Work calmly: for a stuck tube, penetrating oil and patience beat force.

The seals

This is the real job. The old seal sits in the slider, usually behind a circlip.

Circlip out with a pointed pair of pliers.
Old seal out. Often you can use the stanchion as a slide hammer: a few firm pulls and the seal comes with it.
Clean the seat and check for burrs.
New seal in. Use a piece of tube of the right size to drive it in squarely and evenly. Driven in crooked means it leaks again straight away.
Circlip back in.

Always replace the dust cover too. It keeps out the grit that destroys the seal.

The stanchions

Run a fingernail over the tube. Pits or rust marks will cut a new seal within a few hundred kilometres. Light surface rust can be polished out; deeper pitting means a new tube.

The oil

Quantity matters more than brand. Too much oil makes the fork harsh at the end of its travel; too little lets it bottom out.

Use the same amount in each leg, or the fork will work unevenly. Measure with a jug; guessing always goes wrong. The correct quantity for your model is in the parts book or workshop manual.

Reassembly

Slide the tubes back into the yokes and watch the height: both must protrude equally. Tighten the clamp bolts evenly.

Fit the wheel, but do not finally tighten the spindle nut until you have compressed the fork firmly a few times. That lets the fork centre itself and avoids the stresses that destroy seals.

Checking

Push the fork down several times. It should move smoothly and return calmly. The next day, look for oil at the seals.

What you need

A set of fork seals, dust covers, fork oil and possibly new stanchions. Which seal size your model takes depends on the year — look it up in the parts book before ordering.

Parts for this article

Overig