Air suspension repair on the AP-7 at Granollers

Air suspension repair

A burst air bag drops the trailer onto the bump stop and makes it impossible to carry on loaded. We replace the bag at the roadside, check the levelling valve and confirm the axle returns to correct ride height. We also trace slow leaks in the circuit with a detector — the kind that leaves the truck sitting on its stops overnight.

An air-suspended truck rests on rubber bellows working through millions of cycles in dirt, cold and salt. When a bellows cracks, the compressor runs continuously trying to hold height, overheats and wrecks the air dryer: an eighty-euro fault turned into a four-figure bill if you keep driving.

At the roadside you can diagnose a lot: listening for leaks with the axle loaded, watching chassis height at rest, checking the compressor cycle. What you should never do is run hundreds of kilometres on a badly seated axle: it eats tyres and stresses the frame.

What never to do

Do not drive on a burst bag — it wrecks the damper
Do not pack the axle with timber to carry on
Do not ignore a constant hiss of escaping air

Truck leaning at rest. One side lower while empty points to a bellows or levelling valve.

How it works

With the truck loaded and parked safely, soapy water goes over bellows, fittings and the levelling valve to find the exact escape. Once the faulty part is swapped from stock, we verify design ride height and fill cycle, leaving the system free of height-related codes.

1
Find the leak
Soapy water over bellows, lines and valve with the system pressurised.
2
Replace the part
Bellows, fitting or valve using the correct axle reference.
3
Set the height
Design-height check and measured circuit fill time.
4
Loaded test
Full raise/lower cycles watching that height holds.

Component

Axle bellows. Part depending on axle; far below replacing compressor plus dryer.

Rinse the bellows with low-pressure water at every wash and look into their folds: a crack caught early is half an hour of work, not a weekend stranded.

AP-7 · Granollers

Half-way along the corridor, this stretch merges the flows coming off the border with those climbing from Barcelona: braking, overtaking and lane changes without pause.

Granollers and Vallès Oriental access. Dense logistics zone, heavy industrial warehousing. Dangerous curve at km 84.

AP-7

13 – 14

Granollers

Cataluña

24/7

24 hours · 365 days

La JonqueraAP-7 · 2 – 4 · 0 km FigueresAP-7 · 5 – 6 · 18 km GironaAP-7 · 7 – 9 · 45 km BarcelonaAP-7 · 15 – 21 · 145 km

Questions about this stretch

Can you come into my warehouse or estate if I can exit the motorway?

Yes — that's the preferred option around Granollers: we attend inside estates and yards whenever the truck can still move a few kilometres. Leaving the motorway also saves waiting time on the shoulder.

How does Vallès traffic affect your arrival time?

Rush hours (7–9:30 and 17–20) add genuine delay. You get an honest window on the call and, if you're near an exit, we propose the exact spot to meet.

Do you cover the C-60 towards Mataró and the C-17 towards Vic?

Yes, both axes start from our exits. Tell us the road and kilometre marker in the first message so we can plan the van's route properly.

Other services at Granollers

Mobile tyre service AP-7 · Granollers Roadside mechanical breakdown AP-7 · Granollers Brakes and calipers AP-7 · Granollers Reefer and cooling units AP-7 · Granollers Diagnostics and electrics AP-7 · Granollers

Air suspension repair on the AP-7, Granollers