Parts for your 2004 Honda Stream-Brake wheel cylinders

2004 Honda Stream brake wheel cylinders — what’s fitted and what to service

For the 2004 Honda Stream, whether brake wheel cylinders are relevant depends on the variant. Technical sources show that RN1 and RN2 (1.7-litre) models use rear drum brakes, which have brake wheel cylinders, while RN3–RN5 (2.0-litre and some 4WD) models typically use rear disc brakes with calipers and therefore do not have wheel cylinders. This is documented in the Honda Stream (RN1–RN5) Service Manual, Brake System sections (Rear Drum Brakes and Rear Disc Brakes, 2000–2006), and reflected in the Honda Electronic Parts Catalogue (EPC), where RN1/RN2 list rear wheel cylinder and brake shoe assemblies, and RN3–RN5 list rear calipers and pads. Period spec sheets and brochures also note rear drums for many 1.7 models and rear discs for 2.0 models.

When fitted (RN1/RN2), the brake wheel cylinder is the small hydraulic unit that lives inside the rear drum. It converts brake fluid pressure into outward movement of two pistons that press the shoes against the drum, slowing the car. Simple, robust and effective, it’s a vital piece of the Stream’s stopping power.

As part of regular servicing, it pays to check the rear drums for any signs of seepage around the wheel cylinder dust boots, dampness on the backing plate, or fluid splatter on the inside of the rear tyre. A soft or sinking pedal, the car pulling to one side under braking, or uneven shoe wear can also point to a tired or leaking cylinder.

Best practice in Australia and New Zealand is to inspect the rear drums and cylinders every 20,000 km or 12 months, and replace brake fluid every two years. Honda specifies DOT 3 fluid for this era, DOT 4 is acceptable in hotter conditions, but never use silicone DOT 5. If a cylinder is leaking or binding, replace both sides in pairs to keep braking even. Many workshops will fit new quality-brand cylinders rather than rebuild, unless the bore is pristine and the correct seal kit is on hand.

During replacement, the tech will remove the drum, shoes and springs, swap the cylinder, then bleed the rear circuit and ideally perform a full system bleed. They’ll confirm the self-adjuster and handbrake are set correctly, and bed the shoes in with gentle stops. Coastal cars may need extra care for corrosion on the backing plate lands, a light smear of high-temp brake grease on shoe contact points helps prevent squeal. If drums are worn with a lip or beyond spec, machine within limits or replace. Keep brake fluid off paintwork, and use proper brake cleaner for a tidy, safe job.

Not sure which rear brakes the car has? A quick glance through the rear wheel spokes will tell the story: a solid drum means wheel cylinders, a visible caliper over a rotor means no wheel cylinders.

• Symptoms of a failing wheel cylinder: soft pedal, pull to one side, fluid around drum, uneven shoe wear.
• Service tips: replace in pairs, bleed thoroughly, check handbrake travel, use DOT 3/4 per cap/manual.

Technical references used: Honda Stream (RN1–RN5) Service Manual, Brake System — Rear Drum Brakes / Rear Disc Brakes (2000–2006), Honda Electronic Parts Catalogue (EPC) listings for RN1/RN2 (wheel cylinder, shoes) vs RN3–RN5 (rear calipers, pads), 2004 model year market specifications noting rear drum on 1.7 and rear disc on many 2.0 variants.

FAQs

Does my 2004 Honda Stream have brake wheel cylinders or rear discs?
Most RN1/RN2 (1.7-litre) cars have rear drums with wheel cylinders. RN3–RN5 (2.0-litre/selected 4WD) generally have rear discs and no wheel cylinders. Look through the rear wheel: a drum means wheel cylinders, a rotor and caliper means discs. Your model code on the compliance plate or a parts lookup will confirm it.

How often should wheel cylinders be checked or replaced?
Have them inspected every 20,000 km or 12 months, and replace brake fluid every two years. Replace cylinders in pairs if there’s any leak, sticking, or uneven braking. In coastal or high-kilometre use, earlier attention can save shoes and drums.

Can a leaking wheel cylinder be rebuilt, or is replacement better?
Rebuild kits exist and can work if the bore is perfect. In practice, new cylinders from a reputable brand are affordable, faster to fit, and more reliable long-term, especially on older vehicles exposed to Aussie or Kiwi coastal conditions.