Brake Bleeder Leaking or Dead? Fix It With the Right Spare Part

Your workshop brake bleeder has started weeping fluid at the reservoir cap, hissing at a hose joint or refusing to push fluid at all. Often one worn part is to blame, and the matching spare gets the bleeder working again without replacing the whole unit.

At PartsForMachines, these bleeder spares sit in the Sykes Pickavant brake pipe tool spares range: 14 parts, from caps and seals to a gauge, a relay, power leads and a trolley, most of them listed for specific bleeder models.

Bleeder Cap Leaking at the Reservoir: Worn Seal or Wrong Cap?

If a cap that used to seal now weeps, suspect the seal before the cap. Once the O-ring wears, the cap can no longer hold pressure and bleeding becomes patchy. On the 343001V2, the master cylinder cap takes the 343001-51 O-ring, a 45mm ring sold on its own.

Look at the old seal closely. Swelling is a warning sign: brake system rubber is not compatible with mineral oil and can swell when exposed to it. Keep the bleeder’s tank and hoses for brake fluid only. If it never sealed on this car, the cap itself is wrong.

Lost or Wrong Bleeder Cap: Which Replacement Adaptor Fits?

Choose a cap that suits both the car and your bleeder’s connector. Caps in the 343 range are made to work with older and newer Sykes electric bleeders alike, including the 343001V2 and 34400500.

Where no dedicated cap exists, the 34309000 universal cap adaptor covers 41, 52, 63 and 72mm diameters. Its clamp grips the threaded part of the reservoir with no chains, the height and width adjust, and a 90° quick coupler helps in tight engine bays. Many European cars take the angled Euro cap instead; check the application list on its product page before you order.

Fluid or Air Leaking at the Hose: Connector or Whole Hose?

Check the quick connectors first: one damaged connector can put the whole bleeder out of action. Wipe every joint dry, run the pump and watch where fluid or air appears; that tells you which part to order.

On the 34300100 12V automatic bleeder, the 343001-04 female quick connector is the matching spare. If the hose itself is worn, damaged or contaminated, a replacement fluid hose such as the 343001-09 comes complete with its connectors. Hose fit varies between bleeders, so read the model plate and ask our team to confirm the match before you order.

Bleeder Not Pushing Fluid: Gauge, Power Supply or Relay?

Work from the simplest cause up: power first, then the gauge, then the relay. Check the battery lead, clamps and fuse, and confirm the unit runs at all.

Next, watch the gauge. If it is damaged, leaking or reading wrongly, you cannot trust it: the 343001-26 pressure gauge is the 0–6 bar replacement for the 343001V2. If the supply is good but the pump stays silent, suspect the relay or switch. A relay lets a small switch current turn on the motor’s much heavier current, so when it fails the motor may not run.

What Should I Check Before I Order?

the bleeder’s model number from its plate or label, as most spares are listed for specific units
where it leaks: at the cap seal, a quick connector or along the hose
whether the old cap ever sealed on this car (worn seal) or never did (wrong cap)
how it is powered: 12V battery, mains, or mains via an optional charger lead
the gauge: is it damaged or leaking, and does the needle move when the pump runs?

Browse the Sykes Pickavant brake pipe tool spares range, or contact the PartsForMachines team by WhatsApp, telephone or email with your bleeder’s model number and a photo of the worn part.

Product options, delivery options and returns terms are shown on each product page. A 30-day return policy applies to eligible items.

Frequently Asked Questions

My bleeder switched itself off halfway through the job. Is it faulty?

Often not. Sykes says the 343001V2 powers off when its fluid reaches the minimum level, and the Brake Bleeder Pro shuts off when fluid is low or abnormal pressure is detected. If the tank is low, refill it and restart.

My mains-powered bleeder won’t switch on. What should I check?

Check the supply and fuse first. Always fit a fuse of the same rating; if the new one blows too, there is a fault to trace. The 34400500 has a spare on/off switch and the 344005-22 fuse holder.

It has power but the pump never runs. Could it be the relay?

Possibly, once the supply, fuse and switch check out. A failed relay can stop the motor even though the switch works. For the 343001V2 the spare is the 343001-18 relay, which suits that unit only.

Can I run the Brake Bleeder Pro from the mains instead of a battery?

Yes. It normally runs from a 12V battery, but the optional 34313200 220–12V charger lead lets the 34313000 and 34313500 Brake Bleeder Pro units work from mains power.

My 12V bleeder’s power lead is damaged. Can I replace just the lead?

Yes. The 343001-08 12V power lead is the spare for the 34300100 automatic brake bleeder, so check that your model plate reads 34300100 before you order.

A wheel on my 343001V2 has broken. Can I buy just one?

Yes. The 343001-06 is a 5cm spinning wheel with a brake, sold individually as a replacement part for the 343001V2 brake bleeder.

Is there a trolley that holds a 60-litre drum for the Brake Bleeder Pro?

Yes. The 34313100 is the optional trolley for the 34313000 Brake Bleeder Pro and holds cans of up to 60 litres, keeping the drum and bleeder together as you move between bays.

The seals in my Nissan bleeding cap set have perished. Do I need a new set?

No, just new seals, so the caps themselves can stay. The N3580700 cap seal set replaces them in the N3580000 Nissan brake bleeding cap set, which is approved by Nissan Motor GB.

Brake fluid has dripped from a leaking cap onto the paint. What should I do?

Wash it off straight away with plenty of water, because brake fluid damages paintwork. Then fix the leak, whether a worn seal or the wrong cap, before the next job.