Skip to content
Get a Quote

Quality

Viaforta diaphragms are made from rubber blended to a formulation of our own, not bought pre-mixed. That control over the recipe is what sets flex fatigue life and fabric adhesion — and you can test the result yourself with free samples.

Rubber strengthened by a recipe of our own

We buy high-grade rubber as raw material and have it re-blended to a recipe developed with our production partner, then processed at their facility in Istanbul, Türkiye. The compound is optimised around how a brake chamber diaphragm actually works — durability, flexibility and a long service life. Our own formulation and the cord-fabric reinforcement are what the parts are built on to hold up under pressure, continuous duty and repeated deformation. Quality starts with the right raw material and the right recipe.

Three choices in that recipe bear directly on a brake diaphragm

  • Flex fatigue ahead of tensile strength

    A diaphragm is not a gasket. It travels through its full stroke every time the brake is applied, for the whole of its service life. What ends that life is flex cracking, not tearing. A compound tuned for this part trades some tensile strength for flex fatigue resistance — a trade a general-purpose compound has no reason to make.

  • Adhesion between rubber and fabric

    The fabric ply carries the pressure load; the rubber seals and transfers it to the push rod. If the bond between the two gives way, the plies separate and the diaphragm balloons — a failure that shows up as a slow loss of pressure rather than a burst, which is the harder kind for a fleet to catch. That bond is a property of the compound. Buy the compound and you cannot tune it.

  • A curing system matched to the actual press

    Crosslinking is set by time, temperature and the curing package together. A compound formulated around someone else’s cycle is either over-cured in ours — brittle, and short-lived under flexing — or under-cured, which appears later as permanent set: a diaphragm that no longer returns fully and a brake that drifts out of adjustment.

What does it mean in practice?

Traceability. When something has to be explained, the chain runs from the raw material lot through the mix to the finished part, inside one facility. A manufacturer who buys compound can only change supplier.

Do not take our word for it

We will send up to 10 pieces free of charge; you cover the shipping. Fit them, run them, and judge the part on what it does rather than on what we say about it. For a component this straightforward, that is a faster and more honest evaluation than anything we could put in writing.

Request free samples

Claims and returns

Two situations, each with its own terms. Both apply to every order and both are repeated on the proforma invoice.

Problems found on arrival

What it covers
Wrong part, short count, transit damage, or a defect you can see.
Reporting window
14 days from delivery.
What we need
Photographs of the parts as they arrived and of the packaging.
Cost
Ours — the replacement parts and the freight both ways.

Manufacturing faults found in service

What it covers
A fault in the part itself, appearing after it has been fitted. The claim covers replacement of the faulty pieces.
Reporting window
6 months from delivery.
What we need
A sample sent to us for examination.
Cost
Sending the sample is at your cost. If the claim is upheld, we refund what it cost you.

A decision within 10 working days

The examination is done at the production facility. From the day the sample reaches us you have an answer in writing within ten working days, whether or not the findings support the claim.

How is a claim settled?

Replacement parts, or credit against your next order. A cash refund where replacement is not possible.

Quote your order number when you write, and the batch number from the carton if you have it — that is where the examination starts.

Frequently asked questions

Are your products certified?
No. The production facility does not hold ISO 9001 or IATF 16949, and we are not going to imply otherwise. What we offer instead is a part you can test before committing: up to 10 samples free of charge, and production test reports for a batch on request. If certification is a hard requirement in your market, tell us early — it changes what we can do for you, and we would rather say so now than after an order.
Can I see test reports?
Yes. Production test reports for a batch are available on request. Ask when you request a quotation and we will include them.
What are the diaphragms made from?
Fabric-reinforced rubber, blended to a formulation of our own rather than bought pre-mixed.
Why do you not publish hardness, burst pressure or cycle life?
Because they move between production batches. Publishing a fixed figure that a later shipment disagrees with would be worse for you than publishing none. Fit is determined by Type and stroke, and those do not move.
Can you print our brand on the product?
The diaphragm itself ships unbranded; Viaforta branding is on the carton and the label. Printing a brand onto the part requires a dedicated mould and a minimum order — ask and we will quote it.
Where are they made?
At our production partner’s facility in Istanbul, Türkiye.
What if the parts are faulty?
There are two routes, depending on when it shows. Anything visible on arrival — wrong part, short count, transit damage — is reported within 14 days with photographs, and replaced at our cost. A manufacturing fault that appears in service is covered for 6 months from delivery: you send a sample for examination and have a written decision within 10 working days. The full terms are set out above.

Seven questions to ask a new supplier

Get a quote in 24 hours

Send us the part number and quantity. You get a price in USD, Incoterms and a lead time — from a named person, usually the same working day.

Get a Quote in 24 HoursRequest a Free SampleWhatsAppEmail us

Free samples up to 10 pieces are available on request; you cover the shipping only.

Prices are quoted in USD, EXW or FOB Istanbul. Freight is arranged separately. Payment by bank transfer or letter of credit against a proforma invoice.

WhatsApp