CATALOG / hydraulic-bleed
Template · hydraulic-bleed
HYDRAULIC BLEED
Purge air and old fluid from a hydraulic disc brake. Branches by fluid type — DOT vs mineral — because mixing destroys seals (battery-shop ER visit). Tier-2 safety-critical throughout.
Intake: answers gate which atoms compose
brake-type
Brake type (this template is hydraulic-only). Vehicle context is captured separately at ticket intake.
hydraulic-disc
fluid-type
Which brake fluid type is in THIS brake? (Read the lever stamp or the OEM spec — DO NOT bleed if uncertain)
dotmineral
Composed steps · 5 atoms in order
atom:intake-consult2 steps
01intake-consult/IC.1
Listen to the customer describe the problem, then ask clarifying questions to confirm the symptom, when it happens, and what changed recently
capture“What did the customer report, in their words?”
capture“What clarifying questions did you ask, and how did they answer?”
NOTENOTE
02intake-consult/IC.2
Set expectations before work begins: the scope of the planned work, what is not included, and the likely outcome
capture“What scope and expectations did you set with the customer?”
NOTE
atom:bay-readiness2 steps
03bay-readiness/BR.1
Clear and stage the work area: bench clear, vehicle secured on the stand, fire-safe location for any battery work
capture“Work area clear and the vehicle secured?”
capture“Photograph the staged work area.”
PASS / FAILPHOTO
04bay-readiness/BR.2
Select and stage the correct tools for the planned job, and put on the PPE the work requires (gloves, eye protection)
capture“Correct tools staged for this job?”
capture“PPE on for the work being done?”
PASS / FAILPASS / FAIL
atom:power-down-and-photo1 step
05power-down-and-photo/1
Power down + photograph cable routing
capture“Vehicle powered down?”
capture“Snap a photo of the cable routing.”
PASS / FAILPHOTO
atom:hydraulic-bleedwhen brake-type = hydraulic-disc5 steps
06hydraulic-bleed/HB.1
Confirm fluid type for THIS brake model — read the lever stamp, OEM spec sheet, or service manual; if uncertain, DO NOT bleed
capture“Fluid type confirmed against OEM spec — DOT or mineral?”
capture“Brake model identified and OEM source captured?”
DECISION · 3
criticalDOT and mineral are visually similar but chemically incompatible — wrong fluid destroys the lever and caliper seals within hours
criticalWhen in doubt, get the brake model from the cover and confirm against the OEM bleed-procedure source
Cited sourcessign-off seam
source → sram-level-bleed-procedure✓editorial · Afam · 2026-05-28
source → shimano-mt200-bleed-procedure✓editorial · Afam · 2026-05-28
07hydraulic-bleed/HB.2
Remove the pads (or insert a bleed block in their place); this prevents fluid contaminating the friction surfaces during bleed
capture“Pads pulled or bleed block inserted?”
PASS / FAIL
warningAny drop of bleed fluid on pads → permanent contamination, replace the pads
08hydraulic-bleed/HB.3
Execute the bleed procedure for the matched fluid type — branch by fluid-type
branch on fluid-type
Bleed procedure — branch by fluid type
DOT FLUID (SRAM / HAYES / SOME MAGURA)dotdot-5.1dot5.1
HB.dot.1Attach fluid-syringe to caliper Bleeding-Edge port (filled with fresh DOT 5.1); attach catch-syringe to lever bleed port; push fluid UP from caliper toward lever — air rises with the fluid and exits at the lever syringe
capture“Fluid-syringe at caliper; catch-syringe at lever; DOT 5.1 flowing caliper→lever?”
PASS / FAIL
criticalDOT fluid strips paint and corrodes aluminum — keep rags ready, wipe spills immediately, do NOT mix with mineral oil
Cited sourcessign-off seam
source → sram-level-bleed-procedure✓editorial · Afam · 2026-05-28
HB.dot.2Push fluid from the caliper syringe slowly until the lever-side catch-syringe captures clear (not amber) fluid with no air bubbles — typical 10–15 ml per side. Alternate gentle vacuum on the catch-syringe to draw out micro-bubbles.
capture“Volume of DOT 5.1 pushed through — how many ml?”
capture“Catch fluid clear and bubble-free?”
VALUE · mlPASS / FAIL
Cited sourcessign-off seam
source → sram-level-bleed-procedure✓editorial · Afam · 2026-05-28
HB.dot.3Close caliper bleed port FIRST (so vacuum doesn't suck air back), then close lever port; remove syringes
capture“Caliper port closed first, then lever port?”
Cited sourcessign-off seam
source → sram-level-bleed-procedure✓editorial · Afam · 2026-05-28
MINERAL OIL (SHIMANO / MAGURA / TRP)mineralmineral-oil
HB.min.1Attach catch-cup to caliper bleed nipple; attach funnel/syringe of fresh mineral oil to lever reservoir; open caliper nipple slightly
capture“Catch-cup at caliper; funnel at lever; nipple open?”
PASS / FAIL
criticalMineral oil is body-safe but NEVER mix with DOT — even residue in a syringe will contaminate
warningUse a dedicated mineral-only syringe set; label it
Cited sourcessign-off seam
source → shimano-mt200-bleed-procedure✓editorial · Afam · 2026-05-28
HB.min.2Gravity-feed fresh mineral oil from lever down to caliper; pump the lever gently 3–5× to dislodge bubbles, watching the catch-cup
capture“Mineral oil flowing lever→caliper; bubbles being expelled?”
capture“Volume of mineral oil pushed through — how many ml?”
VALUE · mlPASS / FAIL
Cited sourcessign-off seam
source → shimano-mt200-bleed-procedure✓editorial · Afam · 2026-05-28
HB.min.3Close caliper bleed nipple while lever is held in; top up lever reservoir to spec, reinstall cover gasket and lever cover screws
capture“Caliper closed under lever pressure; reservoir topped, cover reseated?”
Cited sourcessign-off seam
source → shimano-mt200-bleed-procedure✓editorial · Afam · 2026-05-28
09hydraulic-bleed/HB.4
Pull bleed block / reinstall pads; pump lever 10× until firm bite — confirm no spongy feel and no fluid weep from the caliper or lever
capture“Pads in; lever firm at full pump; no weeping fluid at caliper or lever?”
PASS / FAILPHOTO
glossary → brakes/bleed-nipple · brakes/hydraulic-hose
10hydraulic-bleed/HB.5
Wipe rotor, caliper, and lever with isopropyl to remove any fluid residue; spin wheel and confirm no rub, no drip
capture“Everything wiped clean; no rotor rub; no fluid drip?”
PASS / FAIL
atom:findings-handoff3 steps
11findings-handoff/FH.1
Explain the findings and the work done in plain language, without jargon, and confirm the customer understands
capture“How did you explain the findings and work to the customer?”
NOTE
12findings-handoff/FH.2
Communicate any battery findings verbally: state of health, charging guidance, and safety notes, and confirm they were understood
capture“What battery findings did you communicate, and how did the customer respond?”
NOTE
13findings-handoff/FH.3
Communicate any drive-system findings verbally: motor, controller, or sensor behavior observed during service
capture“What drive-system findings did you communicate to the customer?”
NOTE
deviation_rules · 6 declared
ad_hoc_step
a captured step is not in the runbook for the resolved vehicle / fluid-type branches
missed_step
a runbook step for the resolved branches has no capture in the job record
missing_required_evidence
a step's capture.evidence item went unfilled by the tech's narration
branch_candidate
narration matches a finding pattern (spongy lever, fluid weep, dirty fluid) but no branch was taken
contaminated_pad_kept
narration mentions oil or brake fluid on pads but no pad-replace step was added
dot_mineral_crossover
narration mentions both DOT and mineral brake fluid in the same job record
snapshot_hash: sha256:5ca723352aac6eb5… · served as ETag on read · X-Relay-Schema-Version: 0.8.0